2021A&A...656A..59Z


Query : 2021A&A...656A..59Z

2021A&A...656A..59Z - Astronomy and Astrophysics, volume 656A, 59-59 (2021/12-1)

Deep Chandra observations of merging galaxy cluster ZwCl 2341+0000.

ZHANG X., SIMIONESCU A., STUARDI C., VAN WEEREN R.J., INTEMA H.T., AKAMATSU H., DE PLAA J., KAASTRA J.S., BONAFEDE A., BRUGGEN M., ZUHONE J. and ICHINOHE Y.

Abstract (from CDS):


Context. Knowledge of X-ray shock and radio relic connection in merging galaxy clusters has been greatly extended in terms of both observation and theory over the last decade. ZwCl 2341+0000 is a double-relic merging galaxy cluster; previous studies have shown that half of the southern relic is associated with an X-ray surface brightness discontinuity, while the other half not. The discontinuity was believed to be a shock front. Therefore, it is a mysterious case of an only partial shock-relic connection.
Aims. By using the 206.5 ks deep Chandra observations, we aim to investigate the nature of the southern surface brightness discontinuity. Meanwhile, we aim to explore new morphological and thermodynamical features.
Methods. We perform both imaging and spectroscopic analyses to investigate the morphological and thermodynamical properties of the cluster. In addition to the X-ray data, we utilize the GMRT 325 MHz image and JVLA 1.5 GHz and 3.0 GHz images to compute radio spectral index maps.
Results. Surface brightness profile fitting and the temperature profile suggest that the previously reported southern surface brightness discontinuity is better described as a sharp change in slope or as a kink. This kink is likely contributed by the disrupted core of the southern subcluster. The radio spectral index maps show spectral flattening at the south-eastern edge of the southern relic, suggesting that the location of the shock front is 640 kpc away from the kink, where the X-ray emission is too faint to detect a surface brightness discontinuity. We update the radio shock Mach number to be M_radio, S_ = 2.2 ± 0.1 and M_radio, N_ = 2.4 ± 0.4 for the southern and northern radio relics based on the injection spectral indices. We also put a 3σ lower limit on the X-ray Mach number of the southern shock to be M_X-ray, S_ > 1.6. Meanwhile, the deep observations reveal that the northern subcluster is in a perfect cone shape, with a ∼400 kpc linear cold front on each side. This type of conic subcluster has been predicted by simulations but is observed here for the first time. It represents a transition stage between a blunt-body cold front and a slingshot cold front. Strikingly, we found a 400 kpc long gas trail attached to the apex of the cone, which could be due to the gas stripping. In addition, an over-pressured hot region is found in the south-western flank of the cluster.

Abstract Copyright: © ESO 2021

Journal keyword(s): X-rays: galaxies: clusters - galaxies: clusters: intracluster medium - galaxies: clusters: individual: ZwCl 2341+0000 - shock waves

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO B0013-005 QSO 00 16 11.08855044 -00 15 12.4454125   20.44 19.98 19.72   ~ 138 1
2 ACO 168 ClG 01 15 09.8 +00 14 51           ~ 350 2
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2001 1
4 ACO 520 ClG 04 54 19.0 +02 56 49           ~ 420 0
5 ICRF J052109.8+163822 Sy1 05 21 09.88596258 +16 38 22.0515459   19.37 18.84 18.480   ~ 818 1
6 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 901 1
7 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 968 2
8 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 165 0
9 ACO 2142 ClG 15 58 20.00 +27 14 00.3           ~ 734 0
10 NAME LHB X 16 42.0 +02 19           ~ 309 0
11 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 442 1
12 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 601 1
13 UGC 12491 BiC 23 18 38.2641503880 +42 57 28.797497604   15.3       ~ 33 1
14 ZwCl 2341+0000 ClG 23 43 40.566 +00 18 18.94           ~ 63 0
15 [VRB2009b] RS-1 Rad 23 43 50.0 +00 14 20           ~ 2 0
16 [VRB2009b] RS-2 Rad 23 43 50.0 +00 14 20           ~ 2 0
17 [VRB2009b] RS-3 Rad 23 43 52.0 +00 16 15           ~ 2 0

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2023.01.31-01:35:17

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