2015A&A...582A..87A


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET11:08:25

2015A&A...582A..87A - Astronomy and Astrophysics, volume 582A, 87-87 (2015/10-1)

Suzaku X-ray study of the double radio relic galaxy cluster CIZA J2242.8+5301.

AKAMATSU H., VAN WEEREN R.J., OGREAN G.A., KAWAHARA H., STROE A., SOBRAL D., HOEFT M., ROETTGERING H., BRUEGGEN M. and KAASTRA J.S.

Abstract (from CDS):

We present the results from Suzaku observations of the merging cluster of galaxies CIZA J2242.8+5301 at z=0.192. To study the physics of gas heating and particle acceleration in cluster mergers, we investigated the X-ray emission from CIZAJ2242.8+5301, which hosts two giant radio relics in the northern and southern part of the cluster. We analyzed data from three-pointed Suzaku observations of CIZA J2242.8+5301 to derive the temperature distribution in four different directions. The intracluster medium (ICM) temperature shows a remarkable drop from 8.5–0.6+0.8keV to 2.7–0.4+0.7keV across the northern radio relic. The temperature drop is consistent with a Mach number Mn=2.7+0.7–0.4 and a shock velocity vshock:n=2300–400+700km/s. We also confirm the temperature drop across the southern radio relic. However, the ICM temperature beyond this relic is much higher than beyond the northern relic, which gives a Mach number Ms=1.7+0.4–0.3 and shock velocity vshock:s=2040–410+550km/s. These results agree with other systems showing a relationship between the radio relics and shock fronts which are induced by merging activity. We compare the X-ray derived Mach numbers with the radio derived Mach numbers from the radio spectral index under the assumption of diffusive shock acceleration in the linear test particle regime. For the northern radio relic, the Mach numbers derived from X-ray and radio observations agree with each other. Based on the shock velocities, we estimate that CIZA J2242.8+5301 is observed approximately 0.6Gyr after core passage. The magnetic field pressure at the northern relic is estimated to be 9% of the thermal pressure.

Abstract Copyright:

Journal keyword(s): shock waves - methods: data analysis - galaxies: clusters: individual: CIZA J2242.8+5301 - X-rays: galaxies: clusters - galaxies: clusters: intracluster medium

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 207 0
2 ACO 520 ClG 04 54 19.0 +02 56 49           ~ 374 0
3 1RXS J060314.8+421439 X 06 03 14.801 +42 14 39.48           ~ 18 0
4 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 779 1
5 ACO 754 ClG 09 08 50.1 -09 38 12           ~ 628 1
6 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4114 2
7 2MASX J13142209-2515456 ClG 13 14 31.5049 -25 15 56.602           ~ 83 0
8 ACO 2034 ClG 15 10 10.80 +33 30 21.6           ~ 171 1
9 ACO 2146 ClG 15 56 04.7 +66 20 24           ~ 133 0
10 NAME LHB X 16 42.0 +02 19           ~ 242 0
11 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 556 1
12 NAME Sausage Cluster ClG 22 42 53.0 +53 01 05           ~ 149 0

    Equat.    Gal    SGal    Ecl

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2019.12.16-11:08:25

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