论文标题
高能量排放成分，人口和对伽马射线发射射线星系的伽马外伽马射线背景的贡献
High energy emission component, population, and contribution to the extragalactic gamma-ray background of gamma-ray emitting radio galaxies
论文作者
论文摘要
在这项研究中，我们系统地研究了61个{\ it fermi}大面积望远镜（LAT）检测到的射电星系的X射线。我们发现，射电星系的高能光谱成分中的峰频率和峰值光度之间存在反相关，类似于Blazars。使用此样品，我们还构建了伽马射线大通宽度星系的伽马射线光度函数（GLF）。我们发现，类似Blazar的GLF形状可以再现其红移和发光性分布，但是Log $ n $ -log $ s $ s $关系优先型模型具有更低的-$ z $ road Galaxies。这表明许多低 - $ z $ gamma-ray loud射线星系。通过利用我们的最新GLF，发现射电星系对外层次伽马射线背景的贡献为1--10 \％。我们进一步研究了伽马射线大通射电星系的性质。与无线电或X射线磁通量有限的射电星系样品相比，伽马射线选定的样品往往缺乏高无线电星系，例如FR-II射线星系。我们还发现，只有$ \ sim $ 10 \％的射电星系是GEV伽马射线的大声。如果伽马射线射线星系具有X射线与CEN A（如CEN A），宽度星系可能有助于与Blazar相当的宇宙MEV伽玛射线背景，而X射线光谱具有X射线A，并且具有较小的伽马射线至X射线磁通量比。
In this study, we systematically studied the X-ray to GeV gamma-ray spectra of 61 {\it Fermi} Large Area Telescope (LAT) detected radio galaxies. We found an anticorrelation between peak frequency and peak luminosity in the high-energy spectral component of radio galaxies, similar to blazars. With this sample, we also constructed a gamma-ray luminosity function (GLF) of gamma-ray-loud radio galaxies. We found that blazar-like GLF shapes can reproduce their redshift and luminosity distribution, but the log$N$-log$S$ relation prefers models with more low-$z$ radio galaxies. This indicates many low-$z$ gamma-ray-loud radio galaxies. By utilizing our latest GLF, the contribution of radio galaxies to the extragalactic gamma-ray background is found to be 1--10\%. We further investigated the nature of gamma-ray-loud radio galaxies. Compared to radio or X-ray flux-limited radio galaxy samples, the gamma-ray selected sample tends to lack high radio power galaxies like FR-II radio galaxies. We also found that only $\sim$10\% of radio galaxies are GeV gamma-ray loud. Radio galaxies may contribute to the cosmic MeV gamma-ray background comparable to blazars if gamma-ray-quiet radio galaxies have X-ray to gamma-ray spectra like Cen A, with a small gamma-ray to X-ray flux ratio.
