Prospect for future MeV gamma-ray active galactic nuclei population studies
Prospect for future MeV gamma-ray active galactic nuclei population studies
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DOI：
10.1093/pasj/psv043
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发表时间：
2015-03
影响因子：
2.3
通讯作者：
Y. Inoue;Yasuyuki T. Tanaka;H. Odaka;A. Takada;Y. Ichinohe;S. Saito;S. Takeda;Tadayuki Takahashi
中科院分区：
文献类型：
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作者：
Y. Inoue;Yasuyuki T. Tanaka;H. Odaka;A. Takada;Y. Ichinohe;S. Saito;S. Takeda;Tadayuki Takahashi
虽然X射线、GeV伽马射线和TeV伽马射线天空已经得到了广泛的研究，但在大约20年前康普顿成像望远镜(COMPTEL)扫描天空后，MeV伽马射线天空还没有得到很好的研究。本文利用最新的Seyferts和平谱射电类星体(FSRQs)的能谱模型和光度函数，研究了未来MeV伽马射线任务中活动星系核群的研究前景。它们都是宇宙MeV伽马射线背景的合理候选者。如果宇宙MeV伽马射线背景辐射主要是来自Seyferts的非热发射，那么需要10erg cm S的灵敏度才能探测到整个天空中的数百个Seyferts。如果FSRQ组成宇宙MeV伽马射线背景，则需要∼4×10erg cm S的灵敏度才能在最近的FSRQ X射线光度函数下探测到数百个FSRQ。然而，基于最新的FSRQ伽马射线光度函数，FSRQ可以解释高达∼30%的MeV本底，即使在10erg cm S的灵敏度下，我们也可以预期数百个FSRQ，这几乎与下一代MeV望远镜的灵敏度目标相同。
While the X-ray, GeV gamma-ray, and TeV gamma-ray skies have been extensively studied, the MeV gamma-ray sky is not well investigated after the Imaging Compton Telescope (COMPTEL) scanned the sky about two decades ago. In this paper, we investigate prospects for active galactic nuclei population studies with future MeV gamma-ray missions using recent spectral models and luminosity functions of Seyferts and flat spectrum radio quasars (FSRQs). Both of them are plausible candidates as the origins of the cosmic MeV gamma-ray background. If the cosmic MeV gamma-ray background radiation is dominated by nonthermal emission from Seyferts, the sensitivity of 10 erg cm s is required to detect several hundred Seyferts in the entire sky. If FSRQs make up the cosmic MeV gamma-ray background, the sensitivity of ∼ 4× 10 erg cm s is required to detect several hundred FSRQs following the recent FSRQ Xray luminosity function. However, based on the latest FSRQ gamma-ray luminosity function, with which FSRQs can explain up to ∼ 30% of the MeV background, we can expect several hundred FSRQs even with the sensitivity of 10 erg cm s which is almost the same as the sensitivity goal of the next generation MeV telescopes.