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arXiv 0809.2467astro-ph
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3C 279在GeV-TeV能量下的固有吸收和估算EBL的结果

Intrinsic absorption in 3C 279 at GeV-TeV energies and consequences for estimates of the EBL

F. Tavecchio, D. Mazin

摘要:

基于观测到的类星体3C279的γ射线谱,考虑到类星体宽线区(BLR)内高能γ射线光子吸收的影响,我们重新讨论了MAGIC合作组最近报道的河外背景光(EBL)水平的极限。我们使用的光电离代码云计算预期的光紫外辐射场内的BLR和光学深度的伽马射线的一组相对扩展的参数。我们发现,伽马射线光子的吸收,虽然重要的源的真实辐射输出的估计,不产生一个重要的硬化的3C279的光谱在能量带MAGIC访问,支持用于推断上限的EBL水平的方法。

英文摘要:

We revisit the limits of the level of the extragalactic background light (EBL) recently reported by the MAGIC collaboration based on the observed gamma-ray spectrum of the quasar 3C279, considering the impact of absorption of high-energy gamma-ray photons inside the broad line region (BLR) of the quasar. We use the photoionization code CLOUDY to calculate the expected optical-UV radiation field inside the BLR and the optical depth to gamma-rays for a relatively extended set of the parameters. We found that the absorption of gamma-ray photons, though important for the estimate of the true radiative output of the source, does not produce an important hardening of the spectrum of 3C279 in the energy band accessible by MAGIC, supporting the method used to infer the upper limits to the level of the EBL.

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