Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory

We present measurements of the large-scale cosmic-ray (CR) anisotropies in R.A., using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 yr. We determine the equatorial dipole component, through a Fourier analysis in R.A. that includes weights for each ev...

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Tipo de recurso:
Fecha de publicación:
2020
Institución:
Universidad de Medellín
Repositorio:
Repositorio UDEM
Idioma:
eng
OAI Identifier:
oai:repository.udem.edu.co:11407/5932
Acceso en línea:
http://hdl.handle.net/11407/5932
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http://purl.org/coar/access_right/c_16ec
id REPOUDEM2_a2f7b16436e61261fc3628dfd05fdf5d
oai_identifier_str oai:repository.udem.edu.co:11407/5932
network_acronym_str REPOUDEM2
network_name_str Repositorio UDEM
repository_id_str
dc.title.none.fl_str_mv Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
spellingShingle Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
Epicoco I.
title_short Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_full Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_fullStr Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_full_unstemmed Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_sort Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
dc.creator.none.fl_str_mv Epicoco I.
Erdmann M.
Escobar C.O.
Etchegoyen A.
Falcke H.
Farmer J.
Farrar G.
Fauth A.C.
Fazzini N.
Feldbusch F.
Fenu F.
Fick B.
Figueira J.M.
Filipčič A.
Freire M.M.
Fujii T.
Fuster A.
Galea C.
Galelli C.
Garciá B.
Vegas A.L.G.
Gemmeke H.
Gesualdi F.
Gherghel-Lascu A.
Ghia P.L.
Giaccari U.
Giammarchi M.
Giller M.
Glombitza J.
Gobbi F.
Golup G.
Berisso M.G.
Vitale P.F.G.
Gongora J.P.
González N.
Goos I.
Góra D.
Gorgi A.
Gottowik M.
Grubb T.D.
Guarino F.
Guedes G.P.
Guido E.
Hahn S.
Halliday R.
Hampel M.R.
Hansen P.
Harari D.
Harvey V.M.
Haungs A.
Hebbeker T.
Heck D.
Hill G.C.
Hojvat C.
Hörandel J.R.
Horvath P.
Hrabovský M.
Huege T.
Hulsman J.
Insolia A.
Isar P.G.
Johnsen J.A.
Jurysek J.
Kaä¨pä A.
Kampert K.H.
Keilhauer B.
Kemp J.
Klages H.O.
Kleifges M.
Kleinfeller J.
Köpke M.
Mezek G.K.
Awad A.K.
Lago B.L.
Lahurd D.
Lang R.G.
Leigui De Oliveira M.A.
Lenok V.
Letessier-Selvon A.
Lhenry-Yvon I.
Presti D.L.
Lopes L.
López R.
Casado A.L.
Lorek R.
Luce Q.
Lucero A.
Payeras A.M.
Malacari M.
Mancarella G.
Mandat D.
Manning B.C.
Manshanden J.
Mantsch P.
Mariazzi A.G.
Mariş I.C.
Marsella G.
Martello D.
Martinez H.
Bravo O.M.
Mastrodicasa M.
Mathes H.J.
Matthews J.
Matthiae G.
Mayotte E.
Mazur P.O.
Medina-Tanco G.
Melo D.
Menshikov A.
Merenda K.-D.
Michal S.
Micheletti M.I.
Miramonti L.
Mockler D.
Mollerach S.
Montanet F.
Morello C.
Morlino G.
Mostafá M.
Müller A.L.
Muller M.A.
Müller S.
Mussa R.
Muzio M.
Namasaka W.M.
Nellen L.
Niculescu-Oglinzanu M.
Niechciol M.
Nitz D.
Nosek D.
Novotny V.
Nožka L.
Nucita A.
Núez L.A.
Palatka M.
Pallotta J.
Panetta M.P.
Papenbreer P.
Parente G.
Parra A.
Pech M.
Pedreira F.
Pkala J.
Pelayo R.
Pea-Rodriguez J.
Pereira L.A.S.
Armand J.P.
Perlin M.
Perrone L.
Peters C.
Petrera S.
Pierog T.
Pimenta M.
Pirronello V.
Platino M.
Pont B.
Pothast M.
Privitera P.
Prouza M.
Puyleart A.
Querchfeld S.
Rautenberg J.
Ravignani D.
Reininghaus M.
Ridky J.
Riehn F.
Risse M.
Ristori P.
Rizi V.
Carvalho W.R.D.
Rojo J.R.
Roncoroni M.J.
Roth M.
Roulet E.
Rovero A.C.
Ruehl P.
Saffi S.J.
Saftoiu A.
Salamida F.
Salazar H.
Salina G.
Gomez J.D.S.
Sánchez F.
Santos E.M.
Santos E.
Sarazin F.
Sarmento R.
Sarmiento-Cano C.
Sato R.
Savina P.
Schäfer C.
Scherini V.
Schieler H.
Schimassek M.
Schimp M.
Schlüter F.
Schmidt D.
Scholten O.
Schovánek P.
Schröder F.G.
Schröder S.
Sciutto S.J.
Scornavacche M.
Shellard R.C.
Sigl G.
Silli G.
Sima O.
Šmída R.
Sommers P.
Soriano J.F.
Souchard J.
Squartini R.
Stadelmaier M.
Stanca D.
Stanič S.
Stasielak J.
Stassi P.
Streich A.
Suárez-Durán M.
Sudholz T.
Suomijärvi T.
Supanitsky A.D.
Šupík J.
Szadkowski Z.
Taboada A.
Taborda O.A.
Tapia A.
Timmermans C.
Tobiska P.
Peixoto C.J.T.
Tomé B.
Elipe G.T.
Travaini A.
Travnicek P.
Trimarelli C.
Trini M.
Tueros M.
Ulrich R.
Unger M.
Urban M.
Vaclavek L.
Galicia J.F.V.
Valio I.
Valore L.
Van Vliet A.
Varela E.
Cárdenas B.V.
Vásquez-Ramírez A.
Veberič D.
Ventura C.
Quispe I.D.V.
Verzi V.
Vicha J.
Villaseor L.
Vink J.
Vorobiov S.
Wahlberg H.
Watson A.A.
Weber M.
Weindl A.
Wiencke L.
Wilczyński H.
Winchen T.
Wirtz M.
Wittkowski D.
Wundheiler B.
Yushkov A.
Zas E.
Zavrtanik D.
Zavrtanik M.
Zehrer L.
Zepeda A.
Ziolkowski M.
Zuccarello F.
author Epicoco I.
author_facet Epicoco I.
Erdmann M.
Escobar C.O.
Etchegoyen A.
Falcke H.
Farmer J.
Farrar G.
Fauth A.C.
Fazzini N.
Feldbusch F.
Fenu F.
Fick B.
Figueira J.M.
Filipčič A.
Freire M.M.
Fujii T.
Fuster A.
Galea C.
Galelli C.
Garciá B.
Vegas A.L.G.
Gemmeke H.
Gesualdi F.
Gherghel-Lascu A.
Ghia P.L.
Giaccari U.
Giammarchi M.
Giller M.
Glombitza J.
Gobbi F.
Golup G.
Berisso M.G.
Vitale P.F.G.
Gongora J.P.
González N.
Goos I.
Góra D.
Gorgi A.
Gottowik M.
Grubb T.D.
Guarino F.
Guedes G.P.
Guido E.
Hahn S.
Halliday R.
Hampel M.R.
Hansen P.
Harari D.
Harvey V.M.
Haungs A.
Hebbeker T.
Heck D.
Hill G.C.
Hojvat C.
Hörandel J.R.
Horvath P.
Hrabovský M.
Huege T.
Hulsman J.
Insolia A.
Isar P.G.
Johnsen J.A.
Jurysek J.
Kaä¨pä A.
Kampert K.H.
Keilhauer B.
Kemp J.
Klages H.O.
Kleifges M.
Kleinfeller J.
Köpke M.
Mezek G.K.
Awad A.K.
Lago B.L.
Lahurd D.
Lang R.G.
Leigui De Oliveira M.A.
Lenok V.
Letessier-Selvon A.
Lhenry-Yvon I.
Presti D.L.
Lopes L.
López R.
Casado A.L.
Lorek R.
Luce Q.
Lucero A.
Payeras A.M.
Malacari M.
Mancarella G.
Mandat D.
Manning B.C.
Manshanden J.
Mantsch P.
Mariazzi A.G.
Mariş I.C.
Marsella G.
Martello D.
Martinez H.
Bravo O.M.
Mastrodicasa M.
Mathes H.J.
Matthews J.
Matthiae G.
Mayotte E.
Mazur P.O.
Medina-Tanco G.
Melo D.
Menshikov A.
Merenda K.-D.
Michal S.
Micheletti M.I.
Miramonti L.
Mockler D.
Mollerach S.
Montanet F.
Morello C.
Morlino G.
Mostafá M.
Müller A.L.
Muller M.A.
Müller S.
Mussa R.
Muzio M.
Namasaka W.M.
Nellen L.
Niculescu-Oglinzanu M.
Niechciol M.
Nitz D.
Nosek D.
Novotny V.
Nožka L.
Nucita A.
Núez L.A.
Palatka M.
Pallotta J.
Panetta M.P.
Papenbreer P.
Parente G.
Parra A.
Pech M.
Pedreira F.
Pkala J.
Pelayo R.
Pea-Rodriguez J.
Pereira L.A.S.
Armand J.P.
Perlin M.
Perrone L.
Peters C.
Petrera S.
Pierog T.
Pimenta M.
Pirronello V.
Platino M.
Pont B.
Pothast M.
Privitera P.
Prouza M.
Puyleart A.
Querchfeld S.
Rautenberg J.
Ravignani D.
Reininghaus M.
Ridky J.
Riehn F.
Risse M.
Ristori P.
Rizi V.
Carvalho W.R.D.
Rojo J.R.
Roncoroni M.J.
Roth M.
Roulet E.
Rovero A.C.
Ruehl P.
Saffi S.J.
Saftoiu A.
Salamida F.
Salazar H.
Salina G.
Gomez J.D.S.
Sánchez F.
Santos E.M.
Santos E.
Sarazin F.
Sarmento R.
Sarmiento-Cano C.
Sato R.
Savina P.
Schäfer C.
Scherini V.
Schieler H.
Schimassek M.
Schimp M.
Schlüter F.
Schmidt D.
Scholten O.
Schovánek P.
Schröder F.G.
Schröder S.
Sciutto S.J.
Scornavacche M.
Shellard R.C.
Sigl G.
Silli G.
Sima O.
Šmída R.
Sommers P.
Soriano J.F.
Souchard J.
Squartini R.
Stadelmaier M.
Stanca D.
Stanič S.
Stasielak J.
Stassi P.
Streich A.
Suárez-Durán M.
Sudholz T.
Suomijärvi T.
Supanitsky A.D.
Šupík J.
Szadkowski Z.
Taboada A.
Taborda O.A.
Tapia A.
Timmermans C.
Tobiska P.
Peixoto C.J.T.
Tomé B.
Elipe G.T.
Travaini A.
Travnicek P.
Trimarelli C.
Trini M.
Tueros M.
Ulrich R.
Unger M.
Urban M.
Vaclavek L.
Galicia J.F.V.
Valio I.
Valore L.
Van Vliet A.
Varela E.
Cárdenas B.V.
Vásquez-Ramírez A.
Veberič D.
Ventura C.
Quispe I.D.V.
Verzi V.
Vicha J.
Villaseor L.
Vink J.
Vorobiov S.
Wahlberg H.
Watson A.A.
Weber M.
Weindl A.
Wiencke L.
Wilczyński H.
Winchen T.
Wirtz M.
Wittkowski D.
Wundheiler B.
Yushkov A.
Zas E.
Zavrtanik D.
Zavrtanik M.
Zehrer L.
Zepeda A.
Ziolkowski M.
Zuccarello F.
author_role author
author2 Erdmann M.
Escobar C.O.
Etchegoyen A.
Falcke H.
Farmer J.
Farrar G.
Fauth A.C.
Fazzini N.
Feldbusch F.
Fenu F.
Fick B.
Figueira J.M.
Filipčič A.
Freire M.M.
Fujii T.
Fuster A.
Galea C.
Galelli C.
Garciá B.
Vegas A.L.G.
Gemmeke H.
Gesualdi F.
Gherghel-Lascu A.
Ghia P.L.
Giaccari U.
Giammarchi M.
Giller M.
Glombitza J.
Gobbi F.
Golup G.
Berisso M.G.
Vitale P.F.G.
Gongora J.P.
González N.
Goos I.
Góra D.
Gorgi A.
Gottowik M.
Grubb T.D.
Guarino F.
Guedes G.P.
Guido E.
Hahn S.
Halliday R.
Hampel M.R.
Hansen P.
Harari D.
Harvey V.M.
Haungs A.
Hebbeker T.
Heck D.
Hill G.C.
Hojvat C.
Hörandel J.R.
Horvath P.
Hrabovský M.
Huege T.
Hulsman J.
Insolia A.
Isar P.G.
Johnsen J.A.
Jurysek J.
Kaä¨pä A.
Kampert K.H.
Keilhauer B.
Kemp J.
Klages H.O.
Kleifges M.
Kleinfeller J.
Köpke M.
Mezek G.K.
Awad A.K.
Lago B.L.
Lahurd D.
Lang R.G.
Leigui De Oliveira M.A.
Lenok V.
Letessier-Selvon A.
Lhenry-Yvon I.
Presti D.L.
Lopes L.
López R.
Casado A.L.
Lorek R.
Luce Q.
Lucero A.
Payeras A.M.
Malacari M.
Mancarella G.
Mandat D.
Manning B.C.
Manshanden J.
Mantsch P.
Mariazzi A.G.
Mariş I.C.
Marsella G.
Martello D.
Martinez H.
Bravo O.M.
Mastrodicasa M.
Mathes H.J.
Matthews J.
Matthiae G.
Mayotte E.
Mazur P.O.
Medina-Tanco G.
Melo D.
Menshikov A.
Merenda K.-D.
Michal S.
Micheletti M.I.
Miramonti L.
Mockler D.
Mollerach S.
Montanet F.
Morello C.
Morlino G.
Mostafá M.
Müller A.L.
Muller M.A.
Müller S.
Mussa R.
Muzio M.
Namasaka W.M.
Nellen L.
Niculescu-Oglinzanu M.
Niechciol M.
Nitz D.
Nosek D.
Novotny V.
Nožka L.
Nucita A.
Núez L.A.
Palatka M.
Pallotta J.
Panetta M.P.
Papenbreer P.
Parente G.
Parra A.
Pech M.
Pedreira F.
Pkala J.
Pelayo R.
Pea-Rodriguez J.
Pereira L.A.S.
Armand J.P.
Perlin M.
Perrone L.
Peters C.
Petrera S.
Pierog T.
Pimenta M.
Pirronello V.
Platino M.
Pont B.
Pothast M.
Privitera P.
Prouza M.
Puyleart A.
Querchfeld S.
Rautenberg J.
Ravignani D.
Reininghaus M.
Ridky J.
Riehn F.
Risse M.
Ristori P.
Rizi V.
Carvalho W.R.D.
Rojo J.R.
Roncoroni M.J.
Roth M.
Roulet E.
Rovero A.C.
Ruehl P.
Saffi S.J.
Saftoiu A.
Salamida F.
Salazar H.
Salina G.
Gomez J.D.S.
Sánchez F.
Santos E.M.
Santos E.
Sarazin F.
Sarmento R.
Sarmiento-Cano C.
Sato R.
Savina P.
Schäfer C.
Scherini V.
Schieler H.
Schimassek M.
Schimp M.
Schlüter F.
Schmidt D.
Scholten O.
Schovánek P.
Schröder F.G.
Schröder S.
Sciutto S.J.
Scornavacche M.
Shellard R.C.
Sigl G.
Silli G.
Sima O.
Šmída R.
Sommers P.
Soriano J.F.
Souchard J.
Squartini R.
Stadelmaier M.
Stanca D.
Stanič S.
Stasielak J.
Stassi P.
Streich A.
Suárez-Durán M.
Sudholz T.
Suomijärvi T.
Supanitsky A.D.
Šupík J.
Szadkowski Z.
Taboada A.
Taborda O.A.
Tapia A.
Timmermans C.
Tobiska P.
Peixoto C.J.T.
Tomé B.
Elipe G.T.
Travaini A.
Travnicek P.
Trimarelli C.
Trini M.
Tueros M.
Ulrich R.
Unger M.
Urban M.
Vaclavek L.
Galicia J.F.V.
Valio I.
Valore L.
Van Vliet A.
Varela E.
Cárdenas B.V.
Vásquez-Ramírez A.
Veberič D.
Ventura C.
Quispe I.D.V.
Verzi V.
Vicha J.
Villaseor L.
Vink J.
Vorobiov S.
Wahlberg H.
Watson A.A.
Weber M.
Weindl A.
Wiencke L.
Wilczyński H.
Winchen T.
Wirtz M.
Wittkowski D.
Wundheiler B.
Yushkov A.
Zas E.
Zavrtanik D.
Zavrtanik M.
Zehrer L.
Zepeda A.
Ziolkowski M.
Zuccarello F.
author2_role author
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description We present measurements of the large-scale cosmic-ray (CR) anisotropies in R.A., using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 yr. We determine the equatorial dipole component, through a Fourier analysis in R.A. that includes weights for each event so as to account for the main detector-induced systematic effects. For the energies at which the trigger efficiency of the array is small, the "east-west" method is employed. Besides using the data from the array with detectors separated by 1500 m, we also include data from the smaller but denser subarray of detectors with 750 m separation, which allows us to extend the analysis down to ∼0.03 EeV. The most significant equatorial dipole amplitude obtained is that in the cumulative bin above 8 EeV, %, which is inconsistent with isotropy at the 6σ level. In the bins below 8 EeV, we obtain 99% CL upper bounds on d ⊥ at the level of 1%-3%. At energies below 1 EeV, even though the amplitudes are not significant, the phases determined in most of the bins are not far from the R.A. of the Galactic center, at GC =-94°, suggesting a predominantly Galactic origin for anisotropies at these energies. The reconstructed dipole phases in the energy bins above 4 EeV point instead to R.A. that are almost opposite to the Galactic center one, indicative of an extragalactic CR origin. © 2020. The American Astronomical Society. All rights reserved..
publishDate 2020
dc.date.accessioned.none.fl_str_mv 2021-02-05T14:58:03Z
dc.date.available.none.fl_str_mv 2021-02-05T14:58:03Z
dc.date.none.fl_str_mv 2020
dc.type.eng.fl_str_mv Article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
http://purl.org/coar/resource_type/c_2df8fbb1
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/article
dc.identifier.issn.none.fl_str_mv 0004637X
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/11407/5932
dc.identifier.doi.none.fl_str_mv 10.3847/1538-4357/ab7236
identifier_str_mv 0004637X
10.3847/1538-4357/ab7236
url http://hdl.handle.net/11407/5932
dc.language.iso.none.fl_str_mv eng
language eng
dc.relation.isversionof.none.fl_str_mv https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084243113&doi=10.3847%2f1538-4357%2fab7236&partnerID=40&md5=c7560c3b4d1a71e27df407aeb245c948
dc.relation.citationvolume.none.fl_str_mv 891
dc.relation.citationissue.none.fl_str_mv 2
dc.relation.references.none.fl_str_mv Ahlers, M., (2019) ApJL, 886, p. L18
Al Samarai The Pierre Auger Collaboration) I.(for, (2016) PoS ICRC2015, p. 372
Bonino, R., Alekseenko, V.V., Deligny, O., (2011) ApJ, 738 (1), p. 67
Calvez, A., Kusenko, A., Nagataki, S., (2010) PhRvL, 105
Candia, J., Mollerach, S., Roulet, E., (2003) Jcap, 5, p. 003
Castellina The Pierre Auger Collaboration) A.(for, (2019) Epjwc, 210, p. 06002
Coleman The Pierre Auger Collaboration) A.(for, (2019) PoS ICRC2019, p. 225
Compton, A.H., Getting, I.A., (1935) PhRv, 47, p. 817
Farley, F.J.M., Storey, J.R., (1954) Ppsa, 67 (11), p. 996
Feretti, L., Giovanni, G., Govoni, F., (2012) A&ARv, 20, p. 54
Greisen, K., (1966) PhRvL, 16, p. 748
Haverkorn, M., (2015) Magnetic Fields in Diffuse Media, Astrophysics and Space Science Library, Vol. 407, p. 483
Collaboration, I., (2012) ApJ, 746 (1), p. 33
Collaboration, I., (2016) ApJ, 826 (2), p. 220
Kachelriess, M., Serpico, P.D., (2006) PhLB, 640, p. 225
Collaboration, K., (2019) ApJ, 870 (2), p. 91
Linsley, J., (1975) PhRvL, 34, p. 1530
Nagashima, K., Fujimoto, K., Sakakibara, S., (1989) NCimC, 12, p. 695
Ptuskin, V.S., Rogovaya, S.I., Zirakashvili, V.N., (1993) A&a, 268, p. 726
Sidelnik The Pierre Auger Collaboration) I.(for, (2013)
Pierre Auger Collaboration, T., (2011) APh, 34, p. 627
Pierre Auger Collaboration, T., (2011) Jcap, 11, p. 022
Pierre Auger Collaboration, T., (2012) ApJS, 203 (2), p. 34
Pierre Auger Collaboration, T., (2013) ApJL, 762, p. L13
Pierre Auger Collaboration, T., (2014) PhRvD, 90
Pierre Auger Collaboration, T., (2014) Jcap, 8, p. 019
Pierre Auger Collaboration, T., (2015) ApJ, 802 (2), p. 111
Pierre Auger Collaboration, T., (2015) Nimpa, 798, p. 172
Pierre Auger Collaboration, T., (2017) Sci, 357, p. 1266
Pierre Auger Collaboration, T., (2017) JInst, 12 (2), p. P02006
Pierre Auger Collaboration, T., (2018) ApJ, 868 (1), p. 4
Verzi The Pierre Auger Collaboration) V.(for, (2019) PoS ICRC2019, p. 450
Zatsepin, G.T., Kuzmin, V.A., (1966) Jetpl, 4, p. 78
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_16ec
rights_invalid_str_mv http://purl.org/coar/access_right/c_16ec
dc.publisher.none.fl_str_mv Institute of Physics Publishing
dc.publisher.faculty.spa.fl_str_mv Facultad de Ciencias Básicas
publisher.none.fl_str_mv Institute of Physics Publishing
dc.source.none.fl_str_mv Astrophysical Journal
institution Universidad de Medellín
repository.name.fl_str_mv Repositorio Institucional Universidad de Medellin
repository.mail.fl_str_mv repositorio@udem.edu.co
_version_ 1814159139848323072
spelling Epicoco I.Erdmann M.Escobar C.O.Etchegoyen A.Falcke H.Farmer J.Farrar G.Fauth A.C.Fazzini N.Feldbusch F.Fenu F.Fick B.Figueira J.M.Filipčič A.Freire M.M.Fujii T.Fuster A.Galea C.Galelli C.Garciá B.Vegas A.L.G.Gemmeke H.Gesualdi F.Gherghel-Lascu A.Ghia P.L.Giaccari U.Giammarchi M.Giller M.Glombitza J.Gobbi F.Golup G.Berisso M.G.Vitale P.F.G.Gongora J.P.González N.Goos I.Góra D.Gorgi A.Gottowik M.Grubb T.D.Guarino F.Guedes G.P.Guido E.Hahn S.Halliday R.Hampel M.R.Hansen P.Harari D.Harvey V.M.Haungs A.Hebbeker T.Heck D.Hill G.C.Hojvat C.Hörandel J.R.Horvath P.Hrabovský M.Huege T.Hulsman J.Insolia A.Isar P.G.Johnsen J.A.Jurysek J.Kaä¨pä A.Kampert K.H.Keilhauer B.Kemp J.Klages H.O.Kleifges M.Kleinfeller J.Köpke M.Mezek G.K.Awad A.K.Lago B.L.Lahurd D.Lang R.G.Leigui De Oliveira M.A.Lenok V.Letessier-Selvon A.Lhenry-Yvon I.Presti D.L.Lopes L.López R.Casado A.L.Lorek R.Luce Q.Lucero A.Payeras A.M.Malacari M.Mancarella G.Mandat D.Manning B.C.Manshanden J.Mantsch P.Mariazzi A.G.Mariş I.C.Marsella G.Martello D.Martinez H.Bravo O.M.Mastrodicasa M.Mathes H.J.Matthews J.Matthiae G.Mayotte E.Mazur P.O.Medina-Tanco G.Melo D.Menshikov A.Merenda K.-D.Michal S.Micheletti M.I.Miramonti L.Mockler D.Mollerach S.Montanet F.Morello C.Morlino G.Mostafá M.Müller A.L.Muller M.A.Müller S.Mussa R.Muzio M.Namasaka W.M.Nellen L.Niculescu-Oglinzanu M.Niechciol M.Nitz D.Nosek D.Novotny V.Nožka L.Nucita A.Núez L.A.Palatka M.Pallotta J.Panetta M.P.Papenbreer P.Parente G.Parra A.Pech M.Pedreira F.Pkala J.Pelayo R.Pea-Rodriguez J.Pereira L.A.S.Armand J.P.Perlin M.Perrone L.Peters C.Petrera S.Pierog T.Pimenta M.Pirronello V.Platino M.Pont B.Pothast M.Privitera P.Prouza M.Puyleart A.Querchfeld S.Rautenberg J.Ravignani D.Reininghaus M.Ridky J.Riehn F.Risse M.Ristori P.Rizi V.Carvalho W.R.D.Rojo J.R.Roncoroni M.J.Roth M.Roulet E.Rovero A.C.Ruehl P.Saffi S.J.Saftoiu A.Salamida F.Salazar H.Salina G.Gomez J.D.S.Sánchez F.Santos E.M.Santos E.Sarazin F.Sarmento R.Sarmiento-Cano C.Sato R.Savina P.Schäfer C.Scherini V.Schieler H.Schimassek M.Schimp M.Schlüter F.Schmidt D.Scholten O.Schovánek P.Schröder F.G.Schröder S.Sciutto S.J.Scornavacche M.Shellard R.C.Sigl G.Silli G.Sima O.Šmída R.Sommers P.Soriano J.F.Souchard J.Squartini R.Stadelmaier M.Stanca D.Stanič S.Stasielak J.Stassi P.Streich A.Suárez-Durán M.Sudholz T.Suomijärvi T.Supanitsky A.D.Šupík J.Szadkowski Z.Taboada A.Taborda O.A.Tapia A.Timmermans C.Tobiska P.Peixoto C.J.T.Tomé B.Elipe G.T.Travaini A.Travnicek P.Trimarelli C.Trini M.Tueros M.Ulrich R.Unger M.Urban M.Vaclavek L.Galicia J.F.V.Valio I.Valore L.Van Vliet A.Varela E.Cárdenas B.V.Vásquez-Ramírez A.Veberič D.Ventura C.Quispe I.D.V.Verzi V.Vicha J.Villaseor L.Vink J.Vorobiov S.Wahlberg H.Watson A.A.Weber M.Weindl A.Wiencke L.Wilczyński H.Winchen T.Wirtz M.Wittkowski D.Wundheiler B.Yushkov A.Zas E.Zavrtanik D.Zavrtanik M.Zehrer L.Zepeda A.Ziolkowski M.Zuccarello F.20202021-02-05T14:58:03Z2021-02-05T14:58:03Z0004637Xhttp://hdl.handle.net/11407/593210.3847/1538-4357/ab7236We present measurements of the large-scale cosmic-ray (CR) anisotropies in R.A., using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 yr. We determine the equatorial dipole component, through a Fourier analysis in R.A. that includes weights for each event so as to account for the main detector-induced systematic effects. For the energies at which the trigger efficiency of the array is small, the "east-west" method is employed. Besides using the data from the array with detectors separated by 1500 m, we also include data from the smaller but denser subarray of detectors with 750 m separation, which allows us to extend the analysis down to ∼0.03 EeV. The most significant equatorial dipole amplitude obtained is that in the cumulative bin above 8 EeV, %, which is inconsistent with isotropy at the 6σ level. In the bins below 8 EeV, we obtain 99% CL upper bounds on d ⊥ at the level of 1%-3%. At energies below 1 EeV, even though the amplitudes are not significant, the phases determined in most of the bins are not far from the R.A. of the Galactic center, at GC =-94°, suggesting a predominantly Galactic origin for anisotropies at these energies. The reconstructed dipole phases in the energy bins above 4 EeV point instead to R.A. that are almost opposite to the Galactic center one, indicative of an extragalactic CR origin. © 2020. The American Astronomical Society. All rights reserved..engInstitute of Physics PublishingFacultad de Ciencias Básicashttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85084243113&doi=10.3847%2f1538-4357%2fab7236&partnerID=40&md5=c7560c3b4d1a71e27df407aeb245c9488912Ahlers, M., (2019) ApJL, 886, p. L18Al Samarai The Pierre Auger Collaboration) I.(for, (2016) PoS ICRC2015, p. 372Bonino, R., Alekseenko, V.V., Deligny, O., (2011) ApJ, 738 (1), p. 67Calvez, A., Kusenko, A., Nagataki, S., (2010) PhRvL, 105Candia, J., Mollerach, S., Roulet, E., (2003) Jcap, 5, p. 003Castellina The Pierre Auger Collaboration) A.(for, (2019) Epjwc, 210, p. 06002Coleman The Pierre Auger Collaboration) A.(for, (2019) PoS ICRC2019, p. 225Compton, A.H., Getting, I.A., (1935) PhRv, 47, p. 817Farley, F.J.M., Storey, J.R., (1954) Ppsa, 67 (11), p. 996Feretti, L., Giovanni, G., Govoni, F., (2012) A&ARv, 20, p. 54Greisen, K., (1966) PhRvL, 16, p. 748Haverkorn, M., (2015) Magnetic Fields in Diffuse Media, Astrophysics and Space Science Library, Vol. 407, p. 483Collaboration, I., (2012) ApJ, 746 (1), p. 33Collaboration, I., (2016) ApJ, 826 (2), p. 220Kachelriess, M., Serpico, P.D., (2006) PhLB, 640, p. 225Collaboration, K., (2019) ApJ, 870 (2), p. 91Linsley, J., (1975) PhRvL, 34, p. 1530Nagashima, K., Fujimoto, K., Sakakibara, S., (1989) NCimC, 12, p. 695Ptuskin, V.S., Rogovaya, S.I., Zirakashvili, V.N., (1993) A&a, 268, p. 726Sidelnik The Pierre Auger Collaboration) I.(for, (2013)Pierre Auger Collaboration, T., (2011) APh, 34, p. 627Pierre Auger Collaboration, T., (2011) Jcap, 11, p. 022Pierre Auger Collaboration, T., (2012) ApJS, 203 (2), p. 34Pierre Auger Collaboration, T., (2013) ApJL, 762, p. L13Pierre Auger Collaboration, T., (2014) PhRvD, 90Pierre Auger Collaboration, T., (2014) Jcap, 8, p. 019Pierre Auger Collaboration, T., (2015) ApJ, 802 (2), p. 111Pierre Auger Collaboration, T., (2015) Nimpa, 798, p. 172Pierre Auger Collaboration, T., (2017) Sci, 357, p. 1266Pierre Auger Collaboration, T., (2017) JInst, 12 (2), p. P02006Pierre Auger Collaboration, T., (2018) ApJ, 868 (1), p. 4Verzi The Pierre Auger Collaboration) V.(for, (2019) PoS ICRC2019, p. 450Zatsepin, G.T., Kuzmin, V.A., (1966) Jetpl, 4, p. 78Astrophysical JournalCosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger ObservatoryArticleinfo:eu-repo/semantics/articlehttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1Aab, A., Imapp, Radboud University Nijmegen, Nijmegen, NetherlandsAbreu, P., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalAglietta, M., Infn, Sezione di Torino, Torino, Italy, Osservatorio Astrofisico di Torino (INAF), Torino, ItalyAlbuquerque, I.F.M., Universidade de Saõ Paulo, Instituto de Física, Saõ Paulo SP, BrazilAlbury, J.M., University of Adelaide, Adelaide, SA, AustraliaAllekotte, I., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaAlmela, A., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Universidad Tecnológica, Nacional-Facultad Regional Buenos Aires, Buenos Aires, ArgentinaCastillo, J.A., Universidad Nacional Autónoma de México,D.F., MexicoAlvarez-Muiz, J., Instituto Galego de Física de Altas Enerxiás (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainAnastasi, G.A., Infn, Sezione di Torino, Torino, Italy, Università Torino, Dipartimento di Fisica, Torino, ItalyAnchordoqui, L., Department of Physics and Astronomy, Lehman College, City University of New York, New York, NY, United StatesAndrada, B., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaAndringa, S., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalAramo, C., Infn, Sezione di Napoli, Napoli, ItalyFerreira, P.R.A., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyAsorey, H., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaAssis, P., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalAvila, G., Observatorio Pierre Auger, Malarguë, Argentina, Observatorio Pierre Auger and Comisión Nacional de Energiá Atómica, Malarguë, ArgentinaBadescu, A.M., University Politehnica of Bucharest, Bucharest, RomaniaBakalova, A., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicBalaceanu, A., Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaBarbato, F., Infn, Sezione di Napoli, Napoli, Italy, Università di Napoli federico II, Dipartimento di Fisica ettore Pancini, Napoli, ItalyLuz, R.J.B., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalBecker, K.H., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyBellido, J.A., University of Adelaide, Adelaide, SA, AustraliaBerat, C., Univ. Grenoble Alpes, Cnrs, Grenoble Institute of Engineering, Univ. Grenoble Alpes, LPSC-IN2P3, Grenoble, F-38000, FranceBertaina, M.E., Infn, Sezione di Torino, Torino, Italy, Università Torino, Dipartimento di Fisica, Torino, ItalyBertou, X., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaBiermann, P.L., Max-Planck-Institut für Radioastronomie, Bonn, GermanyBister, T., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyBiteau, J., Institut de Physique Nucleaíre d'Orsay (IPNO), Université Paris-Sud, Univ. Paris/Saclay, CNRS-IN2P3, Orsay, FranceBlanco, A., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalBlazek, J., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicBleve, C., Univ. Grenoble Alpes, Cnrs, Grenoble Institute of Engineering, Univ. Grenoble Alpes, LPSC-IN2P3, Grenoble, F-38000, FranceBoháčová, M., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicBoncioli, D., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Università Dell'Aquila, Dipartimento di Scienze Fisiche e Chimiche, L'Aquila, ItalyBonifazi, C., Universidade Federal Do Rio de Janeiro, Instituto de Física, Rio de Janeiro, BrazilArbeletche, L.B., Universidade de Saõ Paulo, Instituto de Física, Saõ Paulo SP, BrazilBorodai, N., Institute of Nuclear Physics Pan, Krakow, PolandBotti, A.M., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyBrack, J., Colorado State University, Fort Collins, CO, United StatesBretz, T., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyBriechle, F.L., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyBuchholz, P., Universität Siegen, Fachbereich 7 Physik-Experimentelle Teilchenphysik, Siegen, GermanyBueno, A., Universidad de Granada and C.A.F.P.E., Granada, SpainBuitink, S., Vrije Universiteit Brussels, Brussels, BelgiumBuscemi, M., Infn, Sezione di Catania, Catania, Italy, Università di Catania, Dipartimento di Fisica e Astronomia, Catania, ItalyCaballero-Mora, K.S., Universidad Autónoma de Chiapas, Tuxtla Gutiérrez, Chiapas, MexicoCaccianiga, L., Università di Milano, Dipartimento di Fisica, Milano, ItalyCalcagni, L., Iflp, Universidad Nacional de la Plata and Conicet, La Plata, ArgentinaCancio, A., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Universidad Tecnológica, Nacional-Facultad Regional Buenos Aires, Buenos Aires, ArgentinaCanfora, F., Imapp, Radboud University Nijmegen, Nijmegen, Netherlands, Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Science Park, Amsterdam, NetherlandsCaracas, I., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyCarceller, J.M., Universidad de Granada and C.A.F.P.E., Granada, SpainCaruso, R., Infn, Sezione di Catania, Catania, Italy, Università di Catania, Dipartimento di Fisica e Astronomia, Catania, ItalyCastellina, A., Infn, Sezione di Torino, Torino, Italy, Osservatorio Astrofisico di Torino (INAF), Torino, ItalyCatalani, F., Universidade de Saõ Paulo, Escola de Engenharia de Lorena, Lorena ,SP, BrazilCataldi, G., Infn, Sezione di Lecce, Lecce, ItalyCazon, L., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalCerda, M., Observatorio Pierre Auger, Malarguë, ArgentinaChinellato, J.A., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilChoi, K., Université Libre de Bruxelles (ULB), Brussels, BelgiumChudoba, J., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicChytka, L., Palacky University, Rcptm, Olomouc, Czech RepublicClay, R.W., University of Adelaide, Adelaide, SA, AustraliaCerutti, A.C.C., Inst. de Tecnologias en Deteccion y Astroparticulas (CNEACONICET UNSAM) _aor2 Univ. Tecnologica Nac.-Fac. Reg. Mendoza (CONICET/CNEA), Mendoza, ArgentinaColalillo, R., Infn, Sezione di Napoli, Napoli, Italy, Università di Napoli federico II, Dipartimento di Fisica ettore Pancini, Napoli, ItalyColeman, A., University of Delaware, Department of Physics and Astronomy, Bartol Research Institute, Newark, DE, United StatesColuccia, M.R., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyConceica¸õ, R., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalCondorelli, A., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Gran Sasso Science Institute, L'Aquila, ItalyConsolati, G., Infn, Sezione di Milano, Milano, Italy, Politecnico di Milano, Dipartimento di Scienze e Tecnologie Aerospaziali, Milano, ItalyContreras, F., Observatorio Pierre Auger, Malarguë, Argentina, Observatorio Pierre Auger and Comisión Nacional de Energiá Atómica, Malarguë, ArgentinaConvenga, F., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyCovault, C.E., Case Western Reserve University, Cleveland, OH, United StatesDasso, S., Departamento de Física, Departamento de Ciencias de la Atmósfera y Los Oceános, FCEyN, Universidad de Buenos Aires and Conicet, Buenos Aires, Argentina, Instituto de Astronomiá y Física Del Espacio (IAFE ,CONICET-UBA), Buenos Aires, ArgentinaDaumiller, K., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyDawson, B.R., University of Adelaide, Adelaide, SA, AustraliaDay, J.A., University of Adelaide, Adelaide, SA, AustraliaDe Almeida, R.M., Universidade Federal Fluminense, EEIMVR, Rj, Volta Redonda, BrazilDe Jesús, J., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyDe Jong, S.J., Imapp, Radboud University Nijmegen, Nijmegen, Netherlands, Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Science Park, Amsterdam, NetherlandsDe Mauro, G., Imapp, Radboud University Nijmegen, Nijmegen, Netherlands, Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Science Park, Amsterdam, NetherlandsDe Mello Neto, J.R.T., Universidade Federal Do Rio de Janeiro, Instituto de Física, Rio de Janeiro, Brazil, Universidade Federal Do Rio de Janeiro (UFRJ), Observatório Do Valongo, Rj, Rio de Janeiro, BrazilDe Mitri, I., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Gran Sasso Science Institute, L'Aquila, ItalyDe Oliveira, J., Universidade Federal Fluminense, EEIMVR, Rj, Volta Redonda, BrazilDe Oliveira Franco, D., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilDe Souza, V., Universidade de Saõ Paulo, Instituto de Física de Saõ Carlos, Saõ Carlos, SP, BrazilDebatin, J., Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanyDel Rió, M., Observatorio Pierre Auger and Comisión Nacional de Energiá Atómica, Malarguë, ArgentinaDeligny, O., Institut de Physique Nucleaíre d'Orsay (IPNO), Université Paris-Sud, Univ. Paris/Saclay, CNRS-IN2P3, Orsay, FranceDhital, N., Institute of Nuclear Physics Pan, Krakow, PolandDi Matteo, A., Infn, Sezione di Torino, Torino, ItalyCastro, M.L.D., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilDobrigkeit, C., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilD'Olivo, J.C., Universidad Nacional Autónoma de México,D.F., MexicoDorosti, Q., Universität Siegen, Fachbereich 7 Physik-Experimentelle Teilchenphysik, Siegen, GermanyDos Anjos, R.C., Universidade Federal Do Paraná, Setor Palotina, Palotina, BrazilDova, M.T., Iflp, Universidad Nacional de la Plata and Conicet, La Plata, ArgentinaEbr, J., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicEngel, R., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, Germany, Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanyEpicoco, I., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyErdmann, M., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyEscobar, C.O., Fermi National Accelerator Laboratory, United StatesEtchegoyen, A., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Universidad Tecnológica, Nacional-Facultad Regional Buenos Aires, Buenos Aires, ArgentinaFalcke, H., Imapp, Radboud University Nijmegen, Nijmegen, Netherlands, Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Science Park, Amsterdam, Netherlands, Stichting Astronomisch Onderzoek in Nederland (ASTRON), Dwingeloo, NetherlandsFarmer, J., University of Chicago, Enrico Fermi Institute, Chicago, IL, United StatesFarrar, G., New York University, New York, NY, United StatesFauth, A.C., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilFazzini, N., Fermi National Accelerator Laboratory, United StatesFeldbusch, F., Karlsruhe Institute of Technology, Institut für Prozessdatenverarbeitung und Elektronik, Karlsruhe, GermanyFenu, F., Infn, Sezione di Torino, Torino, Italy, Università Torino, Dipartimento di Fisica, Torino, ItalyFick, B., Michigan Technological University, Houghton, MI, United StatesFigueira, J.M., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaFilipčič, A., Center for Astrophysics and Cosmology (CAC), University of Nova Gorica, Nova Gorica, Slovenia, Experimental Particle Physics Department, J. Stefan Institute, Ljubljana, SloveniaFreire, M.M., Instituto de Física de Rosario (IFIR)-CONICET/U.N.R., Facultad de Ciencias Bioquímicas y Farmaceúticas U.N.R., Rosario, ArgentinaFujii, T., University of Chicago, Enrico Fermi Institute, Chicago, IL, United StatesFuster, A., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Universidad Tecnológica, Nacional-Facultad Regional Buenos Aires, Buenos Aires, ArgentinaGalea, C., Imapp, Radboud University Nijmegen, Nijmegen, NetherlandsGalelli, C., Università di Milano, Dipartimento di Fisica, Milano, Italy, Infn, Sezione di Milano, Milano, ItalyGarciá, B., Inst. de Tecnologias en Deteccion y Astroparticulas (CNEACONICET UNSAM) _aor2 Univ. Tecnologica Nac.-Fac. Reg. Mendoza (CONICET/CNEA), Mendoza, ArgentinaVegas, A.L.G., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyGemmeke, H., Karlsruhe Institute of Technology, Institut für Prozessdatenverarbeitung und Elektronik, Karlsruhe, GermanyGesualdi, F., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyGherghel-Lascu, A., Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaGhia, P.L., Institut de Physique Nucleaíre d'Orsay (IPNO), Université Paris-Sud, Univ. Paris/Saclay, CNRS-IN2P3, Orsay, FranceGiaccari, U., Imapp, Radboud University Nijmegen, Nijmegen, NetherlandsGiammarchi, M., Infn, Sezione di Milano, Milano, ItalyGiller, M., University of Łódź, Faculty of Astrophysics, Łódź, PolandGlombitza, J., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyGobbi, F., Observatorio Pierre Auger, Malarguë, ArgentinaGolup, G., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaBerisso, M.G., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaVitale, P.F.G., Observatorio Pierre Auger, Malarguë, Argentina, Observatorio Pierre Auger and Comisión Nacional de Energiá Atómica, Malarguë, ArgentinaGongora, J.P., Observatorio Pierre Auger, Malarguë, ArgentinaGonzález, N., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaGoos, I., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyGóra, D., Institute of Nuclear Physics Pan, Krakow, PolandGorgi, A., Infn, Sezione di Torino, Torino, Italy, Osservatorio Astrofisico di Torino (INAF), Torino, ItalyGottowik, M., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyGrubb, T.D., University of Adelaide, Adelaide, SA, AustraliaGuarino, F., Infn, Sezione di Napoli, Napoli, Italy, Università di Napoli federico II, Dipartimento di Fisica ettore Pancini, Napoli, ItalyGuedes, G.P., Universidade Estadual de Feira de Santana, Feira de Santana, BrazilGuido, E., Infn, Sezione di Torino, Torino, Italy, Università Torino, Dipartimento di Fisica, Torino, ItalyHahn, S., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyHalliday, R., Case Western Reserve University, Cleveland, OH, United StatesHampel, M.R., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaHansen, P., Iflp, Universidad Nacional de la Plata and Conicet, La Plata, ArgentinaHarari, D., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaHarvey, V.M., University of Adelaide, Adelaide, SA, AustraliaHaungs, A., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyHebbeker, T., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyHeck, D., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyHill, G.C., University of Adelaide, Adelaide, SA, AustraliaHojvat, C., Fermi National Accelerator Laboratory, United StatesHörandel, J.R., Imapp, Radboud University Nijmegen, Nijmegen, Netherlands, Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Science Park, Amsterdam, NetherlandsHorvath, P., Palacky University, Rcptm, Olomouc, Czech RepublicHrabovský, M., Palacky University, Rcptm, Olomouc, Czech RepublicHuege, T., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, Germany, Vrije Universiteit Brussels, Brussels, BelgiumHulsman, J., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyInsolia, A., Infn, Sezione di Catania, Catania, Italy, Università di Catania, Dipartimento di Fisica e Astronomia, Catania, ItalyIsar, P.G., Institute of Space Science, Bucharest-Magurele, RomaniaJohnsen, J.A., Colorado School of Mines, Golden, CO, United StatesJurysek, J., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicKaä¨pä, A., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyKampert, K.H., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyKeilhauer, B., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyKemp, J., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyKlages, H.O., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyKleifges, M., Karlsruhe Institute of Technology, Institut für Prozessdatenverarbeitung und Elektronik, Karlsruhe, GermanyKleinfeller, J., Observatorio Pierre Auger, Malarguë, ArgentinaKöpke, M., Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanyMezek, G.K., Center for Astrophysics and Cosmology (CAC), University of Nova Gorica, Nova Gorica, SloveniaAwad, A.K., Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanyLago, B.L., Centro Federal de Educaca¸õ Tecnológica Celso Suckow da Fonseca, Nova Friburgo, BrazilLahurd, D., Case Western Reserve University, Cleveland, OH, United StatesLang, R.G., Universidade de Saõ Paulo, Instituto de Física de Saõ Carlos, Saõ Carlos, SP, BrazilLeigui De Oliveira, M.A., Universidade Federal Do Abc, Santo André Sp, BrazilLenok, V., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyLetessier-Selvon, A., Laboratoire de Physique Nucleaíre et de Hautes Energies (LPNHE), CNRS-IN2P3, Universités Paris 6 et Paris 7, Paris, FranceLhenry-Yvon, I., Institut de Physique Nucleaíre d'Orsay (IPNO), Université Paris-Sud, Univ. Paris/Saclay, CNRS-IN2P3, Orsay, FrancePresti, D.L., Infn, Sezione di Catania, Catania, Italy, Università di Catania, Dipartimento di Fisica e Astronomia, Catania, ItalyLopes, L., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalLópez, R., Benemérita Universidad Autónoma de Puebla, México, Puebla, MexicoCasado, A.L., Instituto Galego de Física de Altas Enerxiás (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainLorek, R., Case Western Reserve University, Cleveland, OH, United StatesLuce, Q., Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanyLucero, A., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaPayeras, A.M., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilMalacari, M., University of Chicago, Enrico Fermi Institute, Chicago, IL, United StatesMancarella, G., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyMandat, D., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicManning, B.C., University of Adelaide, Adelaide, SA, AustraliaManshanden, J., Universität Hamburg, II. Institut für Theoretische Physik, Hamburg, GermanyMantsch, P., Fermi National Accelerator Laboratory, United StatesMariazzi, A.G., Iflp, Universidad Nacional de la Plata and Conicet, La Plata, ArgentinaMariş, I.C., Université Libre de Bruxelles (ULB), Brussels, BelgiumMarsella, G., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyMartello, D., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyMartinez, H., Universidade de Saõ Paulo, Instituto de Física de Saõ Carlos, Saõ Carlos, SP, BrazilBravo, O.M., Benemérita Universidad Autónoma de Puebla, México, Puebla, MexicoMastrodicasa, M., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Università Dell'Aquila, Dipartimento di Scienze Fisiche e Chimiche, L'Aquila, ItalyMathes, H.J., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyMatthews, J., Louisiana State University, Baton Rouge, LA, United StatesMatthiae, G., Università di Roma tor Vergata, Dipartimento di Fisica, Roma, Italy, Infn, Sezione di Roma tor Vergata, Roma, ItalyMayotte, E., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyMazur, P.O., Fermi National Accelerator Laboratory, United StatesMedina-Tanco, G., Universidad Nacional Autónoma de México,D.F., MexicoMelo, D., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaMenshikov, A., Karlsruhe Institute of Technology, Institut für Prozessdatenverarbeitung und Elektronik, Karlsruhe, GermanyMerenda, K.-D., Colorado School of Mines, Golden, CO, United StatesMichal, S., Palacky University, Rcptm, Olomouc, Czech RepublicMicheletti, M.I., Instituto de Física de Rosario (IFIR)-CONICET/U.N.R., Facultad de Ciencias Bioquímicas y Farmaceúticas U.N.R., Rosario, ArgentinaMiramonti, L., Università di Milano, Dipartimento di Fisica, Milano, Italy, Infn, Sezione di Milano, Milano, ItalyMockler, D., Université Libre de Bruxelles (ULB), Brussels, BelgiumMollerach, S., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaMontanet, F., Univ. Grenoble Alpes, Cnrs, Grenoble Institute of Engineering, Univ. Grenoble Alpes, LPSC-IN2P3, Grenoble, F-38000, FranceMorello, C., Infn, Sezione di Torino, Torino, Italy, Osservatorio Astrofisico di Torino (INAF), Torino, ItalyMorlino, G., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Gran Sasso Science Institute, L'Aquila, ItalyMostafá, M., Pennsylvania State University, University Park, PA, United StatesMüller, A.L., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyMuller, M.A., Universidade Federal Do Rio de Janeiro, Instituto de Física, Rio de Janeiro, Brazil, Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilMüller, S., Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanyMussa, R., Infn, Sezione di Torino, Torino, ItalyMuzio, M., New York University, New York, NY, United StatesNamasaka, W.M., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyNellen, L., Universidad Nacional Autónoma de México,D.F., MexicoNiculescu-Oglinzanu, M., Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaNiechciol, M., Universität Siegen, Fachbereich 7 Physik-Experimentelle Teilchenphysik, Siegen, GermanyNitz, D., Michigan Technological University, Houghton, MI, United StatesNosek, D., Charles University, Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, Prague, Czech RepublicNovotny, V., Charles University, Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, Prague, Czech RepublicNožka, L., Palacky University, Rcptm, Olomouc, Czech RepublicNucita, A., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyNúez, L.A., Universidad Industrial de Santander, Bucaramanga, ColombiaPalatka, M., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicPallotta, J., Centro de Investigaciones en Láseres y Aplicaciones, Citedef and Conicet, Villa Martelli, ArgentinaPanetta, M.P., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyPapenbreer, P., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyParente, G., Instituto Galego de Física de Altas Enerxiás (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainParra, A., Benemérita Universidad Autónoma de Puebla, México, Puebla, MexicoPech, M., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicPedreira, F., Instituto Galego de Física de Altas Enerxiás (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, SpainPkala, J., Institute of Nuclear Physics Pan, Krakow, PolandPelayo, R., U. Profesional Interdisciplinaria en Ing. y Tecnologias Avanzadas Del Inst. Politec. Nac. (UPIITA-IPN), México, MexicoPea-Rodriguez, J., Universidad Industrial de Santander, Bucaramanga, ColombiaPereira, L.A.S., Universidade Estadual de Campinas, Ifgw, Campinas,sp, BrazilArmand, J.P., Universidade de Saõ Paulo, Instituto de Física, Saõ Paulo SP, BrazilPerlin, M., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyPerrone, L., Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalyPeters, C., Rwth Aachen University, III. Physikalisches Institut A, Aachen, GermanyPetrera, S., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Gran Sasso Science Institute, L'Aquila, ItalyPierog, T., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyPimenta, M., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalPirronello, V., Infn, Sezione di Catania, Catania, Italy, Università di Catania, Dipartimento di Fisica e Astronomia, Catania, ItalyPlatino, M., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaPont, B., Imapp, Radboud University Nijmegen, Nijmegen, NetherlandsPothast, M., Imapp, Radboud University Nijmegen, Nijmegen, Netherlands, Nationaal Instituut voor Kernfysica en Hoge Energie Fysica (NIKHEF), Science Park, Amsterdam, NetherlandsPrivitera, P., University of Chicago, Enrico Fermi Institute, Chicago, IL, United StatesProuza, M., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicPuyleart, A., Michigan Technological University, Houghton, MI, United StatesQuerchfeld, S., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyRautenberg, J., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanyRavignani, D., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaReininghaus, M., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyRidky, J., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicRiehn, F., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalRisse, M., Universität Siegen, Fachbereich 7 Physik-Experimentelle Teilchenphysik, Siegen, GermanyRistori, P., Centro de Investigaciones en Láseres y Aplicaciones, Citedef and Conicet, Villa Martelli, ArgentinaRizi, V., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Università Dell'Aquila, Dipartimento di Scienze Fisiche e Chimiche, L'Aquila, ItalyCarvalho, W.R.D., Universidade de Saõ Paulo, Instituto de Física, Saõ Paulo SP, BrazilRojo, J.R., Observatorio Pierre Auger, Malarguë, ArgentinaRoncoroni, M.J., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaRoth, M., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyRoulet, E., Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche, ArgentinaRovero, A.C., Instituto de Astronomiá y Física Del Espacio (IAFE ,CONICET-UBA), Buenos Aires, ArgentinaRuehl, P., Universität Siegen, Fachbereich 7 Physik-Experimentelle Teilchenphysik, Siegen, GermanySaffi, S.J., University of Adelaide, Adelaide, SA, AustraliaSaftoiu, A., Horia Hulubei National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaSalamida, F., Infn Laboratori Nazionali Del Gran Sasso, Assergi (L'Aquila), Italy, Università Dell'Aquila, Dipartimento di Scienze Fisiche e Chimiche, L'Aquila, ItalySalazar, H., Benemérita Universidad Autónoma de Puebla, México, Puebla, MexicoSalina, G., Infn, Sezione di Roma tor Vergata, Roma, ItalyGomez, J.D.S., Universidad Industrial de Santander, Bucaramanga, ColombiaSánchez, F., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaSantos, E.M., Universidade de Saõ Paulo, Instituto de Física, Saõ Paulo SP, BrazilSantos, E., Institute of Physics of the Czech Academy of Sciences, Prague, Czech RepublicSarazin, F., Colorado School of Mines, Golden, CO, United StatesSarmento, R., Laboratório de Instrumentaca¸õ e Física Experimental de Partículas, Lip and Instituto Superior Técnico-IST, Universidade de Lisboa-UL, Lisboa, PortugalSarmiento-Cano, C., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, ArgentinaSato, R., Observatorio Pierre Auger, Malarguë, ArgentinaSavina, P., Institut de Physique Nucleaíre d'Orsay (IPNO), Université Paris-Sud, Univ. Paris/Saclay, CNRS-IN2P3, Orsay, France, Infn, Sezione di Lecce, Lecce, Italy, Università Del Salento, Dipartimento di Matematica e Fisica e. de Giorgi, Lecce, ItalySchäfer, C., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanyScherini, V., Infn, Sezione di Lecce, Lecce, ItalySchieler, H., Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanySchimassek, M., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institute for Experimental Particle Physics (ETP), Karlsruhe, GermanySchimp, M., Bergische Universität Wuppertal, Department of Physics, Wuppertal, GermanySchlüter, F., Instituto de Tecnologiás en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina, Karlsruhe Institute of Technology, Institut für Kernphysik, Karlsruhe, GermanySchmidt, D., Khttp://purl.org/coar/access_right/c_16ecAab A.Abreu P.Aglietta M.Albuquerque I.F.M.Albury J.M.Allekotte I.Almela A.Castillo J.A.Alvarez-Muiz J.Anastasi G.A.Anchordoqui L.Andrada B.Andringa S.Aramo C.Ferreira P.R.A.Asorey H.Assis P.Avila G.Badescu A.M.Bakalova A.Balaceanu A.Barbato F.Luz R.J.B.Becker K.H.Bellido J.A.Berat C.Bertaina M.E.Bertou X.Biermann P.L.Bister T.Biteau J.Blanco A.Blazek J.Bleve C.Boháčová M.Boncioli D.Bonifazi C.Arbeletche L.B.Borodai N.Botti A.M.Brack J.Bretz T.Briechle F.L.Buchholz P.Bueno A.Buitink S.Buscemi M.Caballero-Mora K.S.Caccianiga L.Calcagni L.Cancio A.Canfora F.Caracas I.Carceller J.M.Caruso R.Castellina A.Catalani F.Cataldi G.Cazon L.Cerda M.Chinellato J.A.Choi K.Chudoba J.Chytka L.Clay R.W.Cerutti A.C.C.Colalillo R.Coleman A.Coluccia M.R.Conceica¸õ R.Condorelli A.Consolati G.Contreras F.Convenga F.Covault C.E.Dasso S.Daumiller K.Dawson B.R.Day J.A.De Almeida R.M.De Jesús J.De Jong S.J.De Mauro G.De Mello Neto J.R.T.De Mitri I.De Oliveira J.De Oliveira Franco D.De Souza V.Debatin J.Del Rió M.Deligny O.Dhital N.Di Matteo A.Castro M.L.D.Dobrigkeit C.D'Olivo J.C.Dorosti Q.Dos Anjos R.C.Dova M.T.Ebr J.Engel R.11407/5932oai:repository.udem.edu.co:11407/59322021-02-05 09:58:03.617Repositorio Institucional Universidad de Medellinrepositorio@udem.edu.co