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arXiv 1902.10045astro-ph.HE
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费米大天区望远镜第四源星表

Fermi Large Area Telescope Fourth Source Catalog

LAT collaboration

摘要:

本文介绍了第四个费米大天区望远镜γ射线源表(4FGL)。根据费米伽马射线太空望远镜任务在50 MeV至1 TeV能量范围内的前八年科学数据,它是该能量范围内最深的。相对于3FGL星表,4FGL星表的曝光量是3FGL星表的两倍,并且有许多分析改进,包括更新的银河漫射伽马射线发射模型,以及两组光变曲线(1年和2个月间隔)。4FGL目录包括5064个源以上4西格玛的意义,我们提供本地化和光谱特性。75个来源明确建模为空间扩展,并认为是确定的角度范围,周期性或在其他波长观察到的相关变化的基础上,总的358个来源。对于1336个源,我们尚未在其他波长处找到合理的对应物。超过3130个已确认或相关的来源是耀变体的活动星系,239个是耀变体。

英文摘要:

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 (1-year and 2-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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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