Cuoco 2008 Auger data显示超高能宇宙射线更可能来自AGN而不是GRB

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Title:		A global autocorrelation analysis of the Auger data
Authors:		Cuoco, A.; Hannestad, S.; Haugboelle, T.; Kachelriess, M.; Serpico, P. D.
Publication:		eprint arXiv:0809.4003
Publication Date:		09/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		7 pages, 3 figures
Bibliographic Code:		2008arXiv0809.4003C

Abstract

We perform a global autocorrelation analysis of the Auger data with the aim to constrain the number density $n_s$ of ultrahigh energy cosmic ray (UHECR) sources, estimating at the same time the effect of the bias of UHECR sources and of the systematic energy scale uncertainty on $n_s$. The data show no significant small-scale clustering which may be explained by magnetic deflections over scales of a few degrees. The case of continuous, uniformly distributed sources is disfavored at 99% C.L. and the fit improves if the sources follow the large-scale structure of matter in the universe. The observed clustering starts to restrict the potential mechanisms accelerating UHECRs: Gamma-ray bursts as main UHECR sources are disfavored not only by energy considerations, but also because they require pervasive nG extragalactic magnetic fields to be consistent with the observed clustering, while active galactic nuclei fits well the deduced number density and luminosities.

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