Abstract

We present the results of the optical identification and spectroscopic redshift measurements of 216 galaxy clusters detected in the SRG/eROSITA all-sky X-ray survey. The spectroscopic observations were performed in 2020–2023 with the 6-m BTA telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences, the 2.5-m telescope at the Caucasus Mountain Observatory of the Sternberg Astronomical Institute of the Moscow State University, the 1.6-m AZT-33IK telescope at the Sayan Solar Observatory of the Institute of Solar–Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences, and the 1.5-m Russian–Turkish telescope (RTT-150) at the TÜBİTAK Observatory. For all of the galaxy clusters presented here the spectroscopic redshift measurements have been obtained for the first time. Of these, 139 galaxy clusters have been detected for the first time in the SRG/eROSITA survey and 22 galaxy clusters are at redshifts \(z_{\textrm{spec}}\gtrsim 0.7\) , including three at \(z_{\textrm{spec}}\gtrsim 1\) . Deep direct images with the rizJK filters have also been obtained for four distant galaxy clusters at \(z_{\textrm{spec}}>0.7\) . For these observations we chose the most massive clusters and, therefore, most of the galaxy clusters presented here with the spectroscopic redshifts measured by us will most likely enter in future into the cosmological samples of galaxy clusters from the SRG/eROSITA survey.

中文翻译：

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SRG/eROSITA 全天巡天对 216 个星系团的光学识别和光谱红移测量

摘要

我们展示了 SRG/eROSITA 全天 X 射线巡天中检测到的 216 个星系团的光学识别和光谱红移测量结果。光谱观测是在2020-2023年使用俄罗斯科学院特殊天体物理观测站的6米BTA望远镜、莫斯科国立大学斯滕伯格天文研究所高加索山天文台的2.5米望远镜、俄罗斯科学院西伯利亚分院日地物理研究所萨彦太阳观测站的 1.6 米 AZT-33IK 望远镜，以及 TÜBıTAK 天文台的 1.5 米俄罗斯-土耳其望远镜 (RTT-150)。对于这里展示的所有星系团，光谱红移测量都是首次获得。其中，139个星系团在SRG/eROSITA巡天中首次被发现，22个星系团处于红移\(z_{\textrm{spec}}\gtrsim 0.7\)，其中三个位于\(z_{\) textrm{规格}}\gtrsim 1\)。还获得了位于\(z_{\textrm{spec}}>0.7\) 的四个遥远星系团的使用rizJK滤波器的深层直接图像。对于这些观测，我们选择了最大质量的星团，因此，这里呈现的大多数具有我们测量的光谱红移的星系团很可能在未来进入来自 SRG/eROSITA 巡天的星系团的宇宙学样本。