The high-energy diffuse cosmic gamma-ray background radiation from blazars
The high-energy diffuse cosmic gamma-ray background radiation from blazars
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DOI：
10.1086/186882
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发表时间：
1993-06
期刊：
影响因子：
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通讯作者：
F. Stecker;M. Salamon;M. Malkan
中科院分区：
文献类型：
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作者：
F. Stecker;M. Salamon;M. Malkan
我们预测了耀变体产生的高能宇宙弥散γ射线背景辐射的光谱和通量。我们的计算是基于康普顿天文台EGRET观测的高能伽马射线从这些对象，维普莱观测TeV伽马射线从Mrk 421，和无线电人口研究的平谱射电源。我们的统计分析给出了与线性相关一致的结果。然后，我们使用无线电光度函数和红移演化计算的伽马射线背景。我们发现，耀变体不能解释SAS 2在亚GeV范围内观察到的背景通量水平或陡峭的光谱，但可能在多GeV能量范围及以上提供占主导地位的背景成分。我们预测这个组件的差分光子光谱指数约为2至约10 GeV。超过这个能量，由于伽马射线与星系际红外光子相互作用产生的电子对，光谱应该逐渐变陡。利用Stecker等人（1992）对这种效应的计算，我们估计能量超过TeV的谱指数约为3.5。
We predict the spectrum and flux of the high-energy diffuse cosmic gamma-ray background radiation produced by blazars. Our calculations are based on the Compton Observatory EGRET observations of high-energy gamma-rays from these objects, the Whipple observation of TeV gamma-rays from Mrk 421, and radio population studies of flat-spectrum radio sources. Our statistical analysis gives a result consistent with a linear correlation. We then use the radio luminosity function and redshift evolution to calculate the gamma-ray background. We find that blazars cannot account for the flux level or steep spectrum of the background observed by SAS 2 in the sub-GeV range, but could likely provide the dominant background component in the multi-GeV energy range and above. We predict a differential photon spectral index for this component of about 2 up to about 10 GeV. Above that energy, the spectrum should gradually steepen owing to pair production by interactions of the gamma-rays with intergalactic infrared photons. Using the calculations of this effect by Stecker et al. (1992), we estimate a spectral index of about 3.5 for energies above a TeV.