Calvez 2010 超高能宇宙射线可能来自银河系以前的伽马暴或者超新星

主要内容:
通过磁场的作用，有的现在被散射到了地球。

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Title:		Role of Galactic sources and magnetic fields in forming the observed energy-dependent composition of ultrahigh-energy cosmic rays
Authors:		Calvez, Antoine; Kusenko, Alexander; Nagataki, Shigehiro
Publication:		eprint arXiv:1004.2535
Publication Date:		04/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Comment:		4 pages, 2 figures; accepted for publication in Phys. Rev. Lett
Bibliographic Code:		2010arXiv1004.2535C

Abstract

Recent results from Pierre Auger Observatory, showing energy dependent chemical composition of ultrahigh-energy cosmic rays (UHECRs) with a growing fraction of heavy elements at high energies, suggest a possible non-negligible contribution of the Galactic sources. We show that, in the case of UHECRs produced by gamma-ray bursts (GRBs) or rare types of supernova explosions that took place in Milky Way in the past, the change in UHECR composition can result from the difference in diffusion times for different species. The anisotropy in the direction of the Galactic Center is expected to be a few per cent on average, but the locations of the most recent/closest bursts can be associated with observed clusters of UHECRs.

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