Prospects and requirements for measurements of extragalactic γ-ray lines
Prospects and requirements for measurements of extragalactic γ-ray lines
复制标题
河外γ射线测量的前景和要求
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Griffiths
中科院分区：
文献类型：
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作者：
R. Griffiths
本文简要总结了河外γ谱线测量的要求。511keV的电子-正电子湮没线代表了最好的前景，尽管这条线在活动星系核中大大加宽，但由于先前的活动星系核活动，在星系团和射电叶中应该存在一条窄线。最强的通量应该是来自最近的扩展源的10−4光子cm−2 S−1的量级。
A brief summary is presented of requirements for the measurements of extragalactic γ-ray lines. The electron-positron annihilation line at 511 keV represents the best prospect, and although this line is greatly broadened in active galactic nuclei, a narrow line should be present in clusters of galaxies and radio lobes as a result of prior AGN activity. The strongest fluxes should be of the order of 10−4 photons cm−2 s−1 from the closest extended sources.