arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1501.02003astro-ph.HE
收藏

费米大天区望远镜第三源星表

Fermi Large Area Telescope Third Source Catalog

LAT Collaboration

摘要:

我们提出的第三费米大面积望远镜源目录(3FGL)的来源在100 MeV-300 GeV的范围。根据费米伽马射线太空望远镜任务前四年的科学数据,它是这个能量范围内最深的。相对于2FGL星表,3FGL星表包含了两倍的数据以及一些分析改进,包括事件重建水平的改进校准,银河弥散伽马射线发射的更新模型,源检测的改进程序,以及将LAT源与其他波长的潜在对应物相关联的改进方法。3FGL星表包括3033个4西格玛以上的源,每个源的位置区域,光谱特性和月光变曲线。其中,78个被标记为可能是由于银河系漫发射模型的缺陷。25个源被明确地建模为空间扩展的,并且总体232个源被认为是基于在其他波长处观察到的角范围或相关变化性(周期性或其他)来识别的。对于1009源,我们还没有找到其他波长的合理对应物。超过1100个已确认或相关的源是耀变体的活动星系;其他几个非耀变体的活动星系也出现在3FGL中。脉冲星代表了最大的银河系源类。从银河系源的源计数,我们估计未解决的源的银河系漫发射的贡献是~3%,在1 GeV。

英文摘要:

We present the third Fermi Large Area Telescope source catalog (3FGL) of sources in the 100 MeV-300 GeV range. Based on the first four years of science data from the Fermi Gamma-ray Space Telescope mission, it is the deepest yet in this energy range. Relative to the 2FGL catalog, the 3FGL catalog incorporates twice as much data as well as a number of analysis improvements, including improved calibrations at the event reconstruction level, an updated model for Galactic diffuse gamma-ray emission, a refined procedure for source detection, and improved methods for associating LAT sources with potential counterparts at other wavelengths. The 3FGL catalog includes 3033 sources above 4 sigma significance, with source location regions, spectral properties, and monthly light curves for each. Of these, 78 are flagged as potentially being due to imperfections in the model for Galactic diffuse emission. Twenty-five sources are modeled explicitly as spatially extended, and overall 232 sources are considered as identified based on angular extent or correlated variability (periodic or otherwise) observed at other wavelengths. For 1009 sources we have not found plausible counterparts at other wavelengths. More than 1100 of the identified or associated sources are active galaxies of the blazar class; several other classes of non-blazar active galaxies are also represented in the 3FGL. Pulsars represent the largest Galactic source class. From source counts of Galactic sources we estimate the contribution of unresolved sources to the Galactic diffuse emission is ~3% at 1 GeV.

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。

↑