论文标题
扁平光谱无线电类星体和BL LACS主导了未解决的伽玛射线背景的各向异性
Flat spectrum radio quasars and BL Lacs dominate the anisotropy of the unresolved gamma-ray background
论文作者
论文摘要
我们分析了未解决的伽马射线背景（UGRB）发射的角功率谱（AP），并将其与Fermi-LAT 4FGL目录的分辨伽马射线源的测量特性相结合。我们的目标是剖析伽玛射线天空的组成，并在确定观察到的UGRB各向异性的大小，尤其是在低能量下，建立不同类别的活性银核源源的相关性。我们发现，在光谱分散的物理假设下，即通过将4FGL目录数据作为先验，需要两个人群以适合APS数据，即在较高能量的低能和BL lacs（BLLS）上，即平坦光谱无线电类似物（FSRQ）。推断的光度功能与从4FLG目录获得的FSRQ和BLL的外推很吻合。我们使用这些光度函数来计算来自Blazar的UGRB强度，在1GEV时发现20％的贡献，高于10 GEV的30％。最后，得出了由于消灭暗物质而导致的其他伽马射线排放的界限。
We analyze the angular power spectrum (APS) of the unresolved gamma-ray background (UGRB) emission and combine it with the measured properties of the resolved gamma-ray sources of the Fermi-LAT 4FGL catalog. Our goals are to dissect the composition of the gamma-ray sky and to establish the relevance of different classes of source populations of active galactic nuclei in determining the observed size of the UGRB anisotropy, especially at low energies. We find that, under physical assumptions for the spectral energy dispersion, i.e. by using the 4FGL catalog data as a prior, two populations are required to fit APS data, namely flat spectrum radio quasars (FSRQs) at low energies and BL Lacs (BLLs) at higher energies. The inferred luminosity functions agree well with the extrapolation of the FSRQ and BLL ones obtained from the 4FLG catalog. We use these luminosity functions to calculate the UGRB intensity from blazars, finding a contribution of 20% at 1GeV and 30% above 10 GeV. Finally, bounds on an additional gamma-ray emission due to annihilating dark matter are derived.
