Published January 1, 2021
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Observation of a Very Massive Galaxy Cluster at z=0.76 in the SRG/eROSITA All-Sky Survey
Creators
- Burenin, R. A.1
- Bikmaev, I. F.
- Gilfanov, M. R.
- Grokhovskaya, A. A.2
- Dodonov, S. N.2
- Eselevich, M., V3
- Zaznobin, I. A.1
- Irtuganov, E. N.
- Lyskova, N. S.1
- Medvedev, P. S.1
- Meshcheryakov, A., V1
- Moiseev, A., V
- Sazonov, S. Yu1
- Starobinsky, A. A.4
- Sunyaev, R. A.
- Uklein, R., I2
- Khabibullin, I. I.
- Khamitov, I. M.
- Churazov, E. M.
- 1. Russian Acad Sci, Space Res Inst, Moscow 117997, Russia
- 2. Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Karachai Cherke, Russia
- 3. Russian Acad Sci, Inst Solar Terr Phys, Siberian Branch, Irkutsk 664033, Russia
- 4. Russian Acad Sci, Landau Inst Theoret Phys, Chernogolovka, Russia
Description
The results of multiwavelength observations of the very massive galaxy cluster SRGe CL2305.2-2248 detected in X-rays during the first SRG/eROSITA all-sky survey are discussed. This galaxy cluster has also been detected previously in the millimeter band in the South Pole Telescope (SPT-CL J2305-2248) and Atacama Cosmology Telescope (ACT-CL J2305.1-2248) surveys through the observation of the Sunyaev-Zeldovich effect. The spectroscopic redshift has been measured at the 6-m BTA telescope, z = 0.7573. In addition, deep photometric measurements of galaxies have been performed at the Russian-Turkish 1.5-m telescope (RTT-150). The mass of the cluster is estimated from the eROSITA data to be M-500 = (9.0 +/- 2.5) x 10(14) M-circle dot. We show that this cluster is among several tens of the most massive clusters in the observable Universe and among only a few most massive galaxy clusters at z > 0.6.
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