Fermi Large Area Telescope Fourth Source Catalog
Fermi Large Area Telescope Fourth Source Catalog
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DOI：
10.3847/1538-4365/ab6bcb
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发表时间：
2020-03-01
影响因子：
8.7
通讯作者：
Zaharijas, G.
中科院分区：
文献类型：
--
作者：
Abdollahi, S.;Acero, F.;Zaharijas, G.
我们介绍了第四个费米大面积望远镜星表(4FGL)的伽马射线源。根据费米伽马射线太空望远镜任务在50 MeV到1 TeV能量范围内的前八年科学数据，这是该能量范围内迄今最深的一次。相对于3FGL星表，4FGL星表的曝光量是3FGL星表的两倍，并有许多分析改进，包括银河漫反射伽马射线发射的更新模型和两组光线曲线(一年和两个月的间隔)。4FGL星表包括5064个4西格玛以上的来源，我们提供了这些来源的局部化和光谱性质。75个源被明确地建模为空间扩展，总体上，358个源被认为是基于在其他波长观察到的角度范围、周期性或相关可变性来识别的。对于1336个源，我们没有在其他波长找到可信的对应物。超过3130个已识别或相关的源是blazar类的活动星系，239个是脉冲星。
We present the fourth Fermi Large Area Telescope catalog (4FGL) of gamma-ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest yet in this energy range. Relative to the 3FGL catalog, the 4FGL catalog has twice as much exposure as well as a number of analysis improvements, including an updated model for the Galactic diffuse gamma-ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4 sigma significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall, 358 sources are considered as identified based on angular extent, periodicity, or correlated variability observed at other wavelengths. For 1336 sources, we have not found plausible counterparts at other wavelengths. More than 3130 of the identified or associated sources are active galaxies of the blazar class, and 239 are pulsars.