2020MNRAS.497.4704G

Query : 2020MNRAS.497.4704G

2020MNRAS.497.4704G - Mon. Not. R. Astron. Soc., 497, 4704-4717 (2020/October-1)

Chandra and XMM-Newton observations of A2256: cold fronts, merger shocks, and constraint on the IC emission.

GE C., LIU R.-Y., SUN M., YU H., RUDNICK L., EILEK J., OWEN F., DASADIA S., ROSSETTI M., MARKEVITCH M., CLARKE T.E., JONES T.W., GHIZZARDI S., VENTURI T., FINOGUENOV A. and ECKERT D.

Abstract (from CDS):

We present the results of deep Chandra and XMM-Newton observations of a complex merging galaxy cluster Abell 2256 (A2256) that hosts a spectacular radio relic (RR). The temperature and metallicity maps show clear evidence of a merger between the western subcluster (SC) and the primary cluster (PC). We detect five X-ray surface brightness edges. Three of them near the cluster centre are cold fronts (CFs): CF1 is associated with the infalling SC; CF2 is located in the east of the PC; and CF3 is located to the west of the PC core. The other two edges at cluster outskirts are shock fronts (SFs): SF1 near the RR in the NW has Mach numbers derived from the temperature and the density jumps, respectively, of MT = 1.62 ± 0.12 and Mρ = 1.23 ± 0.06; SF2 in the SE has MT = 1.54 ± 0.05 and Mρ = 1.16 ± 0.13. In the region of the RR, there is no evidence for the correlation between X-ray and radio substructures, from which we estimate an upper limit for the inverse-Compton emission, and therefore set a lower limit on the magnetic field (∼ 450 kpc from PC centre) of B > 1.0 µG for a single power-law electron spectrum or B > 0.4 µG for a broken power-law electron spectrum. We propose a merger scenario including a PC, an SC, and a group. Our merger scenario accounts for the X-ray edges, diffuse radio features, and galaxy kinematics, as well as projection effects.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: clusters: individual: Abell 2256 - galaxies: clusters: intracluster medium - X-rays: galaxies: clusters

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 - 2026 		#notes
1 4C -01.12 LIN 03 34 15.5780017080 -01 10 56.306052300     16     ~ 137 1
2 ClG J0603.3+4214 ClG 06 03.3 +42 14           ~ 141 0
3 2MASX J16503970+7839062 GiC 16 50 39.5663907696 +78 39 06.104737116           ~ 12 0
4 LEDA 84809 GiC 17 00 52.2251220528 +78 41 21.123626136   16.78       ~ 24 0
5 [BF76] K Rad 17 02 18.5 +78 46 03           ~ 7 0
6 2MASX J17024809+7844270 GiC 17 02 48.0327175248 +78 44 27.257001756           ~ 13 1
7 LEDA 59495 rG 17 03 02.7991076016 +78 35 55.241646576           ~ 35 0
8 LEDA 59513 rG 17 03 29.3857127040 +78 37 54.951103560   17.02       ~ 29 0
9 LEDA 59520 rG 17 03 30.0542270136 +78 39 54.244656504   17.57       ~ 36 0
10 NGC 6331 GiG 17 03 35.8891347432 +78 37 44.065968348   14       ~ 19 1
11 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
12 [BF76] G Rad 17 03 43.2 +78 50 04           ~ 14 0
13 Z 355-26 GiC 17 04 13.4489846976 +78 37 43.479069564   16       ~ 16 1
14 Z 355-27 rG 17 04 27.246 +78 38 26.03   15.5       ~ 32 1
15 MCG+13-12-019 rG 17 04 48.1038532800 +78 38 29.215836384   17       ~ 29 0
16 LEDA 84854 rG 17 06 56.2476607032 +78 41 09.149593164   17.69       ~ 17 0
17 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1

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