Observation of a Very Massive Galaxy Cluster at $\boldsymbol{z}$ = 0.76 in the SRG/eROSITA All-Sky Survey - INSPIRE

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Observation of a Very Massive Galaxy Cluster at $\boldsymbol{z}$ = 0.76 in the SRG/eROSITA All-Sky Survey

Aug 20, 2021

10 pages

Published in:

Astron.Lett. 47 (2021) 7, 443-453

Published: Nov 9, 2021

e-Print:

2108.09252 [astro-ph.CO]

DOI:

10.1134/S1063773721070045

View in:

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Abstract: (Springer)

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\pm 2.5)\times 10^{14}M_{\odot}

. 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

.

Note:

10 pages, 6 figures, accepted for publication in Astronomy Letters

galaxy clusters
sky surveys

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