Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory
High Energy Astrophysical Phenomena
2018-12-06 v2
Abstract
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4,8] EeV and EeV, the most significant signal is a dipolar modulation in right ascension at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fitted with a power law with index . The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally we have estimated the quadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.
Keywords
Cite
@article{arxiv.1808.03579,
title = {Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory},
author = {The Pierre Auger Collaboration and A. Aab and P. Abreu and M. Aglietta and I. F. M. Albuquerque and J. M. Albury and I. Allekotte and A. Almela and J. Alvarez Castillo and J. Alvarez-Muñiz and G. A. Anastasi and L. Anchordoqui and B. Andrada and S. Andringa and C. Aramo and H. Asorey and P. Assis and G. Avila and A. M. Badescu and A. Balaceanu and F. Barbato and R. J. Barreira Luz and S. Baur and K. H. Becker and J. A. Bellido and C. Berat and M. E. Bertaina and X. Bertou and P. L. Biermann and J. Biteau and S. G. Blaess and A. Blanco and J. Blazek and C. Bleve and M. Boháčová and C. Bonifazi and N. Borodai and A. M. Botti and J. Brack and T. Bretz and A. Bridgeman and F. L. Briechle and P. Buchholz and A. Bueno and S. Buitink and M. Buscemi and K. S. Caballero-Mora and L. Caccianiga and L. Calcagni and A. Cancio and F. Canfora and J. M. Carceller and R. Caruso and A. Castellina and F. Catalani and G. Cataldi and L. Cazon and J. A. Chinellato and J. Chudoba and L. Chytka and R. W. Clay and A. C. Cobos Cerutti and R. Colalillo and A. Coleman and M. R. Coluccia and R. Conceição and G. Consolati and F. Contreras and M. J. Cooper and S. Coutu and C. E. Covault and B. Daniel and S. Dasso and K. Daumiller and B. R. Dawson and J. A. Day and R. M. de Almeida and S. J. de Jong and G. De Mauro and J. R. T. de Mello Neto and I. De Mitri and J. de Oliveira and V. de Souza and J. Debatin and O. Deligny and N. Dhital and M. L. Díaz Castro and F. Diogo and C. Dobrigkeit and J. C. D'Olivo and Q. Dorosti and R. C. dos Anjos and M. T. Dova and A. Dundovic and J. Ebr and R. Engel and M. Erdmann and C. O. Escobar and A. Etchegoyen and H. Falcke and J. Farmer and G. Farrar and A. C. Fauth and N. Fazzini and F. Feldbusch and F. Fenu and L. P. Ferreyro and J. M. Figueira and A. Filipčič and M. M. Freire and T. Fujii and A. Fuster and B. García and H. Gemmeke and A. Gherghel-Lascu and P. L. Ghia and U. Giaccari and M. Giammarchi and M. Giller and D. Głas and J. Glombitza and G. Golup and M. Gómez Berisso and P. F. Gómez Vitale and N. González and I. Goos and D. Góra and A. Gorgi and M. Gottowik and T. D. Grubb and F. Guarino and G. P. Guedes and E. Guido and R. Halliday and M. R. Hampel and P. Hansen and D. Harari and T. A. Harrison and V. M. Harvey and A. Haungs and T. Hebbeker and D. Heck and P. Heimann and G. C. Hill and C. Hojvat and E. M. Holt and P. Homola and J. R. Hörandel and P. Horvath and M. Hrabovský and T. Huege and J. Hulsman and A. Insolia and P. G. Isar and I. Jandt and J. A. Johnsen and M. Josebachuili and J. Jurysek and A. Kääpä and K. H. Kampert and B. Keilhauer and N. Kemmerich and J. Kemp and H. O. Klages and M. Kleifges and J. Kleinfeller and R. Krause and D. Kuempel and G. Kukec Mezek and A. Kuotb Awad and B. L. Lago and D. LaHurd and R. G. Lang and R. Legumina and M. A. Leigui de Oliveira and V. Lenok and A. Letessier-Selvon and I. Lhenry-Yvon and D. Lo Presti and L. Lopes and R. López and A. López Casado and R. Lorek and Q. Luce and A. Lucero and M. Malacari and M. Mallamaci and G. Mancarella and D. Mandat and P. Mantsch and A. G. Mariazzi and I. C. Mariş and G. Marsella and D. Martello and H. Martinez and O. Martínez Bravo and H. J. Mathes and S. Mathys and J. Matthews and G. Matthiae and E. Mayotte and P. O. Mazur and G. Medina-Tanco and D. Melo and A. Menshikov and K. -D. Merenda and S. Michal and M. I. Micheletti and L. Middendorf and L. Miramonti and B. Mitrica and D. Mockler and S. Mollerach and F. Montanet and C. Morello and G. Morlino and M. Mostafá and A. L. Müller and M. A. Muller and S. Müller and R. Mussa and L. Nellen and P. H. Nguyen and M. Niculescu-Oglinzanu and M. Niechciol and D. Nitz and D. Nosek and V. Novotny and L. Nožka and A Nucita and L. A. Núñez and A. Olinto and M. Palatka and J. Pallotta and P. Papenbreer and G. Parente and A. Parra and M. Pech and F. Pedreira and J. Pękala and R. Pelayo and J. Peña-Rodriguez and L. A. S. Pereira and M. Perlin and L. Perrone and C. Peters and S. Petrera and J. Phuntsok and T. Pierog and M. Pimenta and V. Pirronello and M. Platino and J. Poh and B. Pont and C. Porowski and R. R. Prado and P. Privitera and M. Prouza and A. Puyleart and S. Querchfeld and S. Quinn and R. Ramos-Pollan and J. Rautenberg and D. Ravignani and M. Reininghaus and J. Ridky and F. Riehn and M. Risse and P. Ristori and V. Rizi and W. Rodrigues de Carvalho and J. Rodriguez Rojo and M. J. Roncoroni and M. Roth and E. Roulet and A. C. Rovero and P. Ruehl and S. J. Saffi and A. Saftoiu and F. Salamida and H. Salazar and A. Saleh and G. Salina and F. Sánchez and E. M. Santos and E. Santos and F. Sarazin and R. Sarmento and C. Sarmiento-Cano and R. Sato and P. Savina and M. Schauer and V. Scherini and H. Schieler and M. Schimassek and M. Schimp and D. Schmidt and O. Scholten and P. Schovánek and F. G. Schröder and S. Schröder and J. Schumacher and S. J. Sciutto and R. C. Shellard and G. Sigl and G. Silli and O. Sima and R. Šmída and G. R. Snow and P. Sommers and J. F. Soriano and J. Souchard and R. Squartini and D. Stanca and S. Stanič and J. Stasielak and P. Stassi and M. Stolpovskiy and A. Streich and F. Suarez and M. Suárez-Durán and T. Sudholz and T. Suomijärvi and A. D. Supanitsky and J. Šupík and Z. Szadkowski and A. Taboada and O. A. Taborda and A. Tapia and C. Timmermans and C. J. Todero Peixoto and B. Tomé and G. Torralba Elipe and P. Travnicek and M. Trini and M. Tueros and R. Ulrich and M. Unger and M. Urban and J. F. Valdés Galicia and I. Valiño and L. Valore and P. van Bodegom and A. M. van den Berg and A. van Vliet and E. Varela and B. Vargas Cárdenas and R. A. Vázquez and D. Veberič and C. Ventura and I. D. Vergara Quispe and V. Verzi and J. Vicha and L. Villaseñor and S. Vorobiov and H. Wahlberg and O. Wainberg and A. A. Watson and M. Weber and A. Weindl and M. Wiedeński and L. Wiencke and H. Wilczyński and M. Wirtz and D. Wittkowski and B. Wundheiler and L. Yang and A. Yushkov and E. Zas and D. Zavrtanik and M. Zavrtanik and L. Zehrer and A. Zepeda and B. Zimmermann and M. Ziolkowski and Z. Zong and F. Zuccarello},
journal= {arXiv preprint arXiv:1808.03579},
year = {2018}
}
Comments
Published version, 16 pages, 7 figures, 8 tables