2021A&A...651A..41C


Query : 2021A&A...651A..41C

2021A&A...651A..41C - Astronomy and Astrophysics, volume 651A, 41-41 (2021/7-1)

Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA. I. X-ray morphology, recent merger, and radio halo connection.

CHURAZOV E., KHABIBULLIN I., LYSKOVA N., SUNYAEV R. and BYKOV A.M.

Abstract (from CDS):

This is the first paper in a series of studies of the Coma cluster using the SRG/eROSITA X-ray data obtained in the course of the calibration and performance verification observations. The data cover a ∼3°x3° area around the cluster with a typical exposure time of more than 20 ks. The stability of the instrumental background and operation of the SRG observatory in the scanning mode provided us with an excellent data set for studies of the diffuse emission up to a distance of ∼1.5R200 from the Coma center. In this study, we discuss the rich morphology revealed by the X-ray observations (also in combination with the SZ data) and argue that the most salient features can be naturally explained by a recent (ongoing) merger with the NGC 4839 group. In particular, we identify a faint X-ray bridge connecting the group with the cluster, which is convincing proof that NGC 4839 has already crossed the main cluster. The gas in the Coma core went through two shocks, first through the shock driven by NGC 4839 during its first passage through the cluster some gigayear ago and, more recently, through the "mini-accretion shock" associated with the gas settling back to quasi-hydrostatic equilibrium in the core. After passing through the primary shock, the gas should spend much of the time in a rarefaction region, where radiative losses of electrons are small, until the gas is compressed again by the mini-accretion shock. Unlike "runway" merger shocks, the mini-accretion shock does not feature a rarefaction region downstream and, therefore, the radio emission can survive longer. Such a two-stage process might explain the formation of the radio halo in the Coma cluster.

Abstract Copyright: © E. Churazov et al. 2021

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Abell 1656 - galaxies: clusters: intracluster medium - X-rays: galaxies: clusters - radiation mechanisms: non-thermal - shock waves

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 874 1
2 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1040 1
3 NAME Coma Relic Rad 12 55 +27.2           ~ 56 0
4 NAME NGC 4839 Group GrG 12 57 24.3 +27 29 51           ~ 71 0
5 NGC 4839 rG 12 57 24.3563164776 +27 29 52.203087132 13.56 13.02 12.06     ~ 448 3
6 NAME Coma C Rad 12 59.3 +27 47           ~ 56 1
7 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 11.40 12.122 11.386 ~ 754 3
8 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4528 2
9 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 676 1
10 NGC 4911 LIN 13 00 56.0616749160 +27 47 27.152821212 14.58 13.7 13.33 12.601 12.068 ~ 197 0
11 NGC 4921 LIN 13 01 26.1222244152 +27 53 09.629006748   13.7       ~ 189 0

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2022.08.11-01:10:03

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