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arXiv 1507.07534astro-ph.HE
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$10^{17}$ eV上方宇宙射线和扩散gamma-ray及中微子背景的统一模型

Unified model for cosmic rays above $10^{17}$ eV and the diffuse gamma-ray and neutrino backgrounds

G. Giacinti, M. Kachelriess, O. Kalashev, A. Neronov, D. V. Semikoz

摘要:

我们调查如何在“逃逸模型”中得到的河外质子成分可以解释天体物理来源。我们认为可能的宇宙线(CR)源正常/星暴星系和射电大声活动星系核(AGN)。我们发现,从正常和星暴星系的河外质子总流量的贡献是次显性的,并不适合逃逸模型推导出的光谱形状。在无线电响亮AGN的情况下,我们表明,完整的河外质子谱可以解释由一个单一的源人口,BL Lac/FR I,在这些来源的任何潜在的加速网站。我们计算了这些CR质子与其源内气体相互作用产生的扩散中微子和$γ$射线通量。对于光谱斜率的CR接近$α=2.1-2.2$建议的冲击加速,我们发现,这些UHECR源贡献的各向同性$γ$射线背景和冰立方观测到的天体物理中微子信号的河外部分的主要部分。

英文摘要:

We investigate how the extragalactic proton component derived within the "escape model" can be explained by astrophysical sources. We consider as possible cosmic ray (CR) sources normal/starburst galaxies and radio-loud active galactic nuclei (AGN). We find that the contribution to the total extragalactic proton flux from normal and starburst galaxies is only subdominant and does not fit the spectral shape deduced in the escape model. In the case of radio-loud AGN, we show that the complete extragalactic proton spectrum can be explained by a single source population, BL Lac/FR I, for any of the potential acceleration sites in these sources. We calculate the diffuse neutrino and $γ$-ray fluxes produced by these CR protons interacting with gas inside their sources. For a spectral slope of CRs close to $α=2.1-2.2$ as suggested by shock acceleration, we find that these UHECR sources contribute the dominant fraction of both the isotropic $γ$-ray background and of the extragalactic part of the astrophysical neutrino signal observed by IceCube.

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