An ultraviolet (UV) survey of M31 has been carried out during 2017–19 with the Ultra-Violet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we match the M31 UVIT source catalog with the Chandra source catalog. We find 67 UVIT/Chandra sources detected in a varying number of UV and X-ray bands. The UV and X-ray photometry is analyzed using power-law and blackbody models. The X-ray types include 15 low-mass X-ray binaries (LMXBs) and five active galactic nuclei. Crossmatches with catalogs of stars, clusters, and other source types yield the following: 20 of the UVIT/Chandra sources match with M31 globular clusters, and nine with foreground stars. Three more globular clusters and two more foreground stars are consistent with the UVIT source positions although outside the Chandra match radius of 1''. The UV emission of the UVIT/Chandra sources associated with globular clusters is consistent with emission from blue horizontal branch stars rather than from th...

中文翻译：

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M31中Chandra X射线源的AstroSat UVIT检测

在2017-19年间，使用AstroSat天文台的紫外线成像望远镜（UVIT）仪器对M31进行了紫外线（UV）测量。在这里，我们将M31 UVIT源目录与Chandra源目录匹配。我们发现在不同数量的紫外线和X射线带中检测到67个UVIT /钱德拉来源。使用幂律和黑体模型分析UV和X射线光度法。X射线类型包括15个低质量X射线双星（LMXB）和5个活跃的银河核。与恒星，星团和其他源类型的类别的交叉匹配产生以下结果：UVIT / Chandra源中的20个与M31球状星团匹配，而九个与前景星匹配。尽管Chandra匹配半径超出1''，但另外三个球状星团和另外两个前景星与UVIT源位置一致。