Fermi和MAGIC观测伽马射线暴的模拟包括漫射背景光引起的衰减
Modeling gamma-ray burst observations by Fermi and MAGIC including attenuation due to diffuse background light
摘要：
来自河外源的伽马射线通过与河外背景光（EBL）的漫射光子的成对产生相互作用而衰减。伽马射线暴（GRB）是一个高于10 GeV的高红移光子源，因此可以作为演化的紫外背景辐射的探测器。在本文中，我们开发了一个简单的唯象模型的数量和红移分布的伽马射线暴，可以看到在GeV的能量与费米卫星和MAGIC大气切伦科夫望远镜。我们估计每年观测到的伽马射线数量，并显示如何通过考虑与不断发展的EBL的不同实现的相互作用来修改这一结果。我们还讨论了明亮的费米伽玛暴080916C在这个模型的背景下。我们发现，在费米的LAT可以预期看到一个小数目的光子超过10 GeV，每年从遥远的伽玛暴。像MAGIC这样的地面仪器的年度结果由于望远镜的低占空比和天空覆盖范围而变化很大。然而，成功地从地面观测到明亮或中等强度的伽玛暴可以提供数百个来自高红移的光子，这几乎肯定对限制伽玛暴物理和高红移EBL非常有用。
英文摘要：
Gamma rays from extragalactic sources are attenuated by pair-production interactions with diffuse photons of the extragalactic background light (EBL). Gamma-ray bursts (GRBs) are a source of high-redshift photons above 10 GeV, and could be therefore useful as a probe of the evolving UV background radiation. In this paper, we develop a simple phenomenological model for the number and redshift distribution of gamma-ray bursts that can be seen at GeV energies with the Fermi satellite and MAGIC atmospheric Cherenkov telescope. We estimate the observed number of gamma rays per year, and show how this result is modified by considering interactions with different realizations of the evolving EBL. We also discuss the bright Fermi GRB 080916C in the context of this model. We find that the LAT on Fermi can be expected to see a small number of photons above 10 GeV each year from distant GRBs. Annual results for ground-based instruments like MAGIC are highly variable due to the low duty cycle and sky coverage of the telescope. However, successfully viewing a bright or intermediate GRB from the ground could provide hundreds of photons from high redshift, which would almost certainly be extremely useful in constraining both GRB physics and the high-redshift EBL.
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