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Van Den Berg AM, Van Velzen S, Van Vliet A, Varela E, Vargas Cardenas B, Varner G, Vazquez JR, Vazquez RA, Veberic D, Verzi V, Vicha J, Videla M, Villasenor L, Vlcek B, Vorobiov S, Wahlberg H, Wainberg O, Walz D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Werner F, Widom A, Wiencke L, Wilczynska B, Wilczynski H, Williams C, Winchen T, Wittkowski D, Wundheiler B, Wykes S, Yamamoto T, Yapici T, Yuan G, Yushkov A, Zamorano B, Zas E, Zavrtanik D, Zavrtanik M, Zepeda A, Zhou J, Zhu Y, Zimbres Silva M, Ziolkowski M, Zuccarello F (2015)
Publication Status: Published
Publication Type: Journal article
Publication year: 2015
Publisher: IOP PUBLISHING LTD
Book Volume: 802
Article Number: ARTN 111
Journal Issue: 2
DOI: 10.1088/0004-637X/802/2/111
We present the results of an analysis of the large angular scale distribution of the arrival directions of cosmic rays with energy above 4 EeV detected at the Pierre Auger Observatory including for the first time events with zenith angle between 60 degrees and 80 degrees. We perform two Rayleigh analyses, one in the right ascension and one in the azimuth angle distributions, that are sensitive to modulations in right ascension and declination, respectively. The largest departure from isotropy appears in the E > 8 EeV energy bin, with an amplitude for the first harmonic in right ascension r(1)(alpha) = (4.4 +/- 1.0) x 10(-2), that has a chance probability P(>= r(1)(alpha)) = 6.4 x 10(-5), reinforcing the hint previously reported with vertical events alone.
APA:
Aab, A., Abreu, P., Aglietta, M., Ahn, E.J., Al Samarai, I., Albuquerque, I.F.M.,... Zuccarello, F. (2015). LARGE SCALE DISTRIBUTION OF ULTRA HIGH ENERGY COSMIC RAYS DETECTED AT THE PIERRE AUGER OBSERVATORY WITH ZENITH ANGLES UP TO 80 degrees. Astrophysical Journal, 802(2). https://dx.doi.org/10.1088/0004-637X/802/2/111
MLA:
Aab, A., et al. "LARGE SCALE DISTRIBUTION OF ULTRA HIGH ENERGY COSMIC RAYS DETECTED AT THE PIERRE AUGER OBSERVATORY WITH ZENITH ANGLES UP TO 80 degrees." Astrophysical Journal 802.2 (2015).
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