Optical Identification and Spectroscopic Redshift Measurements of 216 Galaxy Clusters from the SRG/eROSITA All-Sky Survey
I. A. Zaznobin (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), R. A. Burenin (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), A. A. Belinski (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), I. F. Bikmaev (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia, Kazan Federal University, Kazan, Russia), M. R. Gilfanov (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Academy of Sciences of Tatarstan, Kazan, Russia), A. V. Dodin (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), S. N. Dodonov (Max Planck Institut f"ur Astrophysik, Garching, Germany), M. V. Eselevich (Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Russia), S. F. Zheltoukhov (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), E. N. Irtuganov (Kazan Federal University, Kazan, Russia), S. S. Kotov (Max Planck Institut f"ur Astrophysik, Garching, Germany), R. A. Krivonos (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), N. S. Lyskova (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), E. A. Malygin (Max Planck Institut f"ur Astrophysik, Garching, Germany), N. A. Maslennikova (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), P. S. Medvedev (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), A. V. Meshcheryakov (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), A. V. Moiseev (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Max Planck Institut f"ur Astrophysik, Garching, Germany), D. V. Oparin (Max Planck Institut f"ur Astrophysik, Garching, Germany), S. A. Potanin (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia, Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, Irkutsk, Russia), K. A. Postnov (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), S. Yu. Sazonov (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), B. S. Safonov (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), N. A. Sakhibullin (Kazan Federal University, Kazan, Russia, Faculty of Physics, Moscow State University, Moscow, Russia), A. A. Starobinsky (Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Russia), M. V. Suslikov (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia, Kazan Federal University, Kazan, Russia), R. A. Sunyaev (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Academy of Sciences of Tatarstan, Kazan, Russia), A. M. Tatarnikov (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia, Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, Irkutsk, Russia), G. S. Uskov (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), R. I. Uklein (Max Planck Institut f"ur Astrophysik, Garching, Germany), I. I. Khabibullin (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Academy of Sciences of Tatarstan, Kazan, Russia), I. M. Khamitov (Kazan Federal University, Kazan, Russia, Faculty of Physics, Moscow State University, Moscow, Russia), G. A. Khorunzhev (Space Research Institute, Russian Academy of Sciences, Moscow, Russia), E. M. Churazov (Space Research Institute, Russian Academy of Sciences, Moscow, Russia, Academy of Sciences of Tatarstan, Kazan, Russia), E. S. Shablovinskaya (Max Planck Institut f"ur Astrophysik, Garching, Germany), N. I. Shatsky (Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), .
arXiv:2403.18625v1 Announce Type: new
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 T”{U}B.{I}TAK 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 $z_{spec} gtrsim 0.7$, including three at $z_{spec} gtrsim 1$. Deep direct images with the rizJK filters have also been obtained for four distant galaxy clusters at $z_{spec} > 0.7$. For these observations the most massive clusters are selected. Therefore, most of the galaxy clusters presented here most likely will be included in the cosmological samples of galaxy clusters from the SRG/eROSITA survey.arXiv:2403.18625v1 Announce Type: new
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 T”{U}B.{I}TAK 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 $z_{spec} gtrsim 0.7$, including three at $z_{spec} gtrsim 1$. Deep direct images with the rizJK filters have also been obtained for four distant galaxy clusters at $z_{spec} > 0.7$. For these observations the most massive clusters are selected. Therefore, most of the galaxy clusters presented here most likely will be included in the cosmological samples of galaxy clusters from the SRG/eROSITA survey.