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arXiv 1011.6340astro-ph.HEhep-ph
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视线cosmic ray相互作用在形成TeV γ射线和高能中微子中遥远耀变体谱中的作用

Role of line-of-sight cosmic ray interactions in forming the spectra of distant blazars in TeV gamma rays and high-energy neutrinos

Warren Essey, Oleg Kalashev, Alexander Kusenko, John F. Beacom

摘要:

活动星系核(AGN)可以产生伽马射线和宇宙射线。观测到的来自遥远耀变体的高能伽马射线信号可能主要是由宇宙射线质子与背景光子相互作用沿视线产生的次级伽马射线。这解释了在遥远的耀变体中观测到的令人惊讶的低衰减,因为平均而言,次级伽马射线的产生距离地球比距离源的距离近得多。因此,在TeV范围内观察到的光谱不依赖于固有的伽马射线光谱,而它取决于宇宙射线源的输出。我们将这一假设应用于一些来源,在每种情况下,我们都获得了很好的拟合,加强了对所观察到的光谱的解释,这是由于二次伽马射线。我们探讨了这种解释的限制银河系外的背景光和活动星系核中的宇宙射线的生产的后果。我们还对中微子信号进行了预测,这有助于探测活动星系核中宇宙射线的加速。

英文摘要:

Active galactic nuclei (AGN) can produce both gamma rays and cosmic rays. The observed high-energy gamma-ray signals from distant blazars may be dominated by secondary gamma rays produced along the line of sight by the interactions of cosmic-ray protons with background photons. This explains the surprisingly low attenuation observed for distant blazars, because the production of secondary gamma rays occurs, on average, much closer to Earth than the distance to the source. Thus the observed spectrum in the TeV range does not depend on the intrinsic gamma-ray spectrum, while it depends on the output of the source in cosmic rays. We apply this hypothesis to a number of sources and, in every case, we obtain an excellent fit, strengthening the interpretation of the observed spectra as being due to secondary gamma rays. We explore the ramifications of this interpretation for limits on the extragalactic background light and for the production of cosmic rays in AGN. We also make predictions for the neutrino signals, which can help probe acceleration of cosmic rays in AGN.

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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