Impacto
Downloads
Downloads per month over past year
Aranda, V. M. and Arqueros Martínez, Fernando and García Pinto, Diego and Minaya Flores, Ignacio Andrés and Rosado, J. and Vázquez Peñas, José Ramón (2015) Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the Pierre Auger Observatory. Astrophysical journal, 804 (1). ISSN 0004-637X
Preview |
PDF
2MB |
Official URL: http://dx.doi.org/10.1088/0004-637X/804/1/15
Abstract
We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from -90 to +45 in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Véron-Cetty and Véron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes, self-clustering of event directions at angular scales up to 30°, and different threshold energies between 40 and 80 EeV. We then look for correlations of cosmic rays with celestial structures both in the Galaxy (the Galactic Center and Galactic Plane) and in the local universe (the Super-Galactic Plane). We also examine their correlation with different populations of nearby extragalactic objects: galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with jets, and the Centaurus A (Cen A) galaxy. None of the tests show statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ~1.4%) are obtained for cosmic rays with E > 58 EeV in rather large windows around Swift AGNs closer than 130 Mpc and brighter than 1044 erg s−1 (18° radius), and around the direction of Cen A (15° radius).
Item Type: | Article |
---|---|
Additional Information: | © 2015. The American Astronomical Society. |
Uncontrolled Keywords: | Surface detector; Upper limit; Sky; Spectrum; Catalog; Array; Nuclei; Field |
Subjects: | Sciences > Physics > Nuclear physics |
ID Code: | 31273 |
Deposited On: | 03 Jul 2015 16:44 |
Last Modified: | 10 Dec 2018 14:57 |
Origin of downloads
Repository Staff Only: item control page