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Tiffenberg J, Timmermans C, Tiwari DK, Tkaczyk W, Todero Peixoto CJ, Tome B, Tonachini A, Travnicek P, Tridapalli DB, Tristram G, Trovato E, Tueros M, Ulrich R, Unger M, Urban M, Valdes Galicia JF, Valino I, Valore L, Van Den Berg AM, Varela E, Vargas Cardenas B, Vazquez JR, Vazquez RA, Veberic D, Verzi V, Vicha J, Videla M, Villasenor L, Wahlberg H, Wahrlich P, Wainberg O, Warner D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Westerhoff S, Whelan BJ, Wieczorek G, Wiencke L, Wilczynska B, Wilczynski H, Will M, Williams C, Winchen T, Winders L, Winnick MG, Wommer M, Wundheiler B, Yamamoto T, Yapici T, Younk P, Yuan G, Yushkov A, Zamorano B, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Ziolkowski M (2011)
Publication Status: Published
Publication Type: Journal article
Publication year: 2011
Publisher: IOP PUBLISHING LTD
Article Number: ARTN 022
Journal Issue: 6
DOI: 10.1088/1475-7516/2011/06/022
The Pierre Auger Collaboration has reported. evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies E > E-th = 5.5 x 10(19) eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at E > E-th are heavy nuclei with charge Z, the proton component of the sources should lead to excesses in the same regions at energies E/Z. We here report the lack of anisotropies in these directions at energies above E-th/Z (for illustrative values of Z = 6, 13, 26). If the anisotropies above E-th are due to nuclei with charge Z, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies.
APA:
Abreu, P., Aglietta, M., Ahn, E.J., Albuquerque, J.F.M., Allard, D., Allekotte, I.,... Ziolkowski, M. (2011). Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory. Journal of Cosmology and Astroparticle Physics, 6. https://dx.doi.org/10.1088/1475-7516/2011/06/022
MLA:
Abreu, Pedro, et al. "Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory." Journal of Cosmology and Astroparticle Physics 6 (2011).
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