eROSITA河外CalPV偶然星表
The eROSITA extragalactic CalPV serendipitous catalog
摘要：
Spectrum-Roentgen-Gamma（SRG）天文台上的eROSITA X射线望远镜在2019年9月至2019年12月期间进行了校准和性能验证（CalPV）观测，这是计划中的四年全天空调查之前。其中大多数是深度的，指向模式的观察。我们在这里提出的X射线目录检测到的一组银河系外的CalPV观测公布给公众的德国eROSITA财团，和这些X射线源的多波段对应物。我们开发了一种通过在背景测量中包括扩展X射线发射来优化点状X射线源的源检测方法。使用CatWISE目录中的贝叶斯方法鉴定多波段对应物。结合11个CalPV场，我们提出了一个包含9515个X射线源的目录，其X射线通量通过光谱拟合测量。77%的来源提供了CatWISE对应物。在99个源中发现了显着的变化，这也是本文所提出的。这些区域中的大多数显示出与典型的河外区域相似的点源数量，还有一些区域拥有特殊的恒星星族。
英文摘要：
The eROSITA X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) observatory performed calibration and performance verification (CalPV) observations between September 2019 and December 2019, ahead of the planned four-year all-sky surveys. Most of them were deep, pointing-mode observations. We present here the X-ray catalog detected from the set of extra-galactic CalPV observations released to the public by the German eROSITA consortium, and the multiband counterparts of these X-ray sources. We developed a source detection method optimized for point-like X-ray sources by including extended X-ray emission in the background measurement. The multiband counterparts were identified using a Bayesian method from the CatWISE catalog. Combining 11 CalPV fields, we present a catalog containing 9515 X-ray sources, whose X-ray fluxes were measured through spectral fitting. CatWISE counterparts are presented for 77% of the sources. Significant variabilities are found in 99 of the sources, which are also presented with this paper. Most of these fields show similar number counts of point sources as typical extragalactic fields, and a few harbor particular stellar populations.
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