Abstract

During a deep extragalactic Lockman Hole sky survey with an area of 18.5 sq. deg, which was conducted when the SRG observatory was flying to the Lagrange point L2, the eROSITA telescope detected \({\sim}7000\) X-ray sources. These objects were then provisionally identified and classified using the publicly accessible data of optical and infrared sky surveys by the SRGz machine learning system developed for this purpose at the Space Research Institute of the Russian Academy of Sciences. As a result, a number of new candidates for distant quasars (\(z\sim 4\)) have been selected. The spectroscopic observations of the first two candidates from this list carried out with the 1.6-m AZT-33IK telescope of the Sayan Solar Observatory have confirmed that these objects are actually distant quasars at redshifts 3.878 and 4.116 and are characterized by a high X-ray luminosity \({\sim}10^{45}\) erg s\({}^{-1}\) (2–10 keV). The results obtained allow one to count on the detection of a large number of distant quasars during a four-year all-sky survey of the SRG observatory begun in December 2019.

中文翻译：

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SRG轨道天文台的eROSITA望远镜在深度洛克曼孔调查中发现的第一个遥远的X射线类星体（$$ \ boldsymbol {z \ sim 4} $$）

摘要

当SRG天文台飞行到拉格朗日L2点时，进行了一次银河系深深的洛克曼霍尔天空调查，面积为18.5平方米，eROSITA望远镜检测到\（{\ sim} 7000 \） X射线源。然后，由俄罗斯科学院太空研究所为此目的开发的SRGz机器学习系统使用可公开获取的光学和红外天空测量数据，对这些物体进行临时标识和分类。结果，许多新的遥距类星体候选对象（\（z \ sim 4 \））已被选中。使用萨彦太阳能天文台的1.6米AZT-33IK望远镜对列表中的前两个候选者进行光谱观察，证实这些物体实际上是红移3.878和4.116的遥远类星体，并具有高X射线特征发光度\（{\ sim} 10 ^ {45} \） erg s \（{} ^ {-1} \）（2–10 keV）。从2019年12月开始，对SRG天文台进行了为期四年的全天候调查，所获得的结果使人们可以依靠对大量遥远类星体的探测。