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arXiv 1609.03336astro-ph.HE
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宇宙光子对UHECR源模型的强约束

Cosmogenic photons strongly constrain UHECR source models

Arjen van Vliet

摘要:

利用我们最新版本的超高能宇宙线(UHECR)传播蒙特卡罗程序CRPropa 3,可以预测由于UHECR与河外背景光相互作用而产生的中微子和光子通量。再加上费米LAT最近更新的各向同性扩散伽马射线背景(IGRB)数据,现在可以严格限制UHECR源模型。UHECR源的演化在确定预期的二次光子谱中尤其起着重要的作用。纯质子UHECR模型已经受到强烈的约束,主要是费米LAT的IGRB的最高能量箱,只要它们的数密度在最近没有强烈的峰值。

英文摘要:

With the newest version of our Monte Carlo code for ultra-high-energy cosmic ray (UHECR) propagation, CRPropa 3, the flux of neutrinos and photons due to interactions of UHECRs with extragalactic background light can be predicted. Together with the recently updated data for the isotropic diffuse gamma-ray background (IGRB) by Fermi LAT, it is now possible to severely constrain UHECR source models. The evolution of the UHECR sources especially plays an important role in the determination of the expected secondary photon spectrum. Pure proton UHECR models are already strongly constrained, primarily by the highest energy bins of Fermi LAT's IGRB, as long as their number density is not strongly peaked at recent times.

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