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arXiv 1011.2672astro-ph.HEhep-ph
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超高能宇宙射线的起源及其谱裂

Origin of the Ultrahigh-Energy Cosmic Rays and their Spectral Break

Shlomo Dado, Arnon Dar, A. De Rujula

摘要:

皮埃尔·俄歇天文台观测到的能量在宇宙线踝以上的高能宇宙射线(UHECR)的能谱、成分和到达方向,如果假设其起源于河外,则会出现不一致的情况。然而,它们的观测特性,是那些由银河系伽马射线暴中发射的高度相对论性喷流加速的UHECR所预期的,其中大部分都是从地球发射的。如果这种替代解释是正确的,那么在50 EeV附近观察到的UHECR能谱的断裂不是Greisen-Zatsepin-Kuzmin截止,而是来自银河系的高能铁宇宙射线自由逃逸的能量阈值,并且高于它们各自的自由逃逸阈值能量,UHECR核应该指向它们的银河系源或它们的残余,而不是GZK视界内的活动星系核(AGN)。

英文摘要:

The energy spectrum, composition and arrival directions of ultrahigh energy cosmic rays (UHECRs) with energy above the cosmic ray ankle, measured by the Pierre Auger Observatory, are inconsistent if their origin is assumed to be extragalactic. Their observed properties, however, are those expected from UHECRs accelerated by the highly relativistic jets emitted in Galactic gamma ray bursts, most of which are beamed away from Earth. If this alternative interpretation is correct, the observed break in the energy spectrum of UHECRs around 50 EeV is not the Greisen-Zatsepin-Kuzmin cutoff but the energy threshold for free escape of ultrahigh energy iron cosmic rays from the Galaxy and above their respective free-escape threshold-energies, UHECR nuclei should point back to their Galactic sources or their remnants rather than to active galactic nuclei (AGN) within the GZK horizon.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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