2011A&A...528A..38V


Query : 2011A&A...528A..38V

2011A&A...528A..38V - Astronomy and Astrophysics, volume 528A, 38-38 (2011/4-1)

A double radio relic in the merging galaxy cluster ZwCl 0008.8+5215.

VAN WEEREN R.J., HOEFT M., ROETTGERING H.J.A., BRUEGGEN M., INTEMA H.T. and VAN VELZEN S.

Abstract (from CDS):

Some merging galaxy clusters host diffuse elongated radio sources, also called radio relics. It is proposed that these radio relics trace shock waves in the intracluster medium (ICM) created during a cluster merger event. Within the shock waves particles are accelerated to relativistic energies, and in the presence of a magnetic field synchrotron radiation will be emitted. Here we present giant metrewave radio telescope (GMRT) and Westerbork synthesis radio telescope (WSRT) observations of a new double relic in the galaxy cluster ZwCl 0008.8+5215. The aim of the observation is to understand the phenomenon of radio relics. We carried out radio continuum observations at 241 and 610MHz with the GMRT, and 1.3-1.8GHz observations with the WSRT in full polarization mode. Optical V, R, and I band images of the cluster were taken with the 2.5m Isaac Newton Telescope (INT). An optical spectrum, to determine the redshift of the cluster, was taken with the William Herschel Telescope (WHT). Our observations show the presence of a double radio relic in the galaxy cluster ZwCl 0008.8+5215, for which we find a spectroscopic redshift of z=0.1032±0.0018 from an optical spectrum of one of the cD galaxies. The spectral index of the two relics steepens inwards to the cluster center. For part of the relics, we measure a polarization fraction in the range ∼5-25%. A ROSAT X-ray image displays an elongated ICM and the large-scale distribution of galaxies reveals two cluster cores, all pointing towards a binary cluster merger event. The radio relics are located symmetrically with respect to the X-ray center of the cluster, along the proposed merger axis. The relics have a linear extent of 1.4Mpc and 290kpc. This factor of five difference in linear size is unlike that of previously known double relic systems, for which the sizes do not differ by more than a factor of two. We conclude that the double relics in ZwCl 0008.8+5215 are best explained by two outward moving shock waves in which particles are (re)accelerated trough the diffusive shock acceleration (DSA) mechanism.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: clusters: individual: ZwCl 0008.8+5215 - large-scale structure of Universe

Nomenclature: Figs 3+7, Table 3: [VHR2011] RW (Nos RE, RW), [VHR2011] A (Nos A-I).

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J00111135+5232421 NIR 00 11 11.352 +52 32 42.13           ~ 1 0
2 4C 52.01 Rad 00 11 20 +52 38.2           ~ 1 0
3 NVSS J001121+523144 Rad 00 11 21.26 +52 31 45.0           ~ 2 2
4 2MASX J00112171+5231437 rG 00 11 21.716 +52 31 43.71           ~ 6 0
5 2MASX J00112859+5228096 G 00 11 28.7 +52 28 10           ~ 3 0
6 ZwCl 0008+5215 ClG 00 11 37.197 +52 32 31.68           ~ 36 0
7 1RXS J001145.3+523147 X 00 11 45.3 +52 31 47           ~ 2 0
8 2MASX J00120320+5234132 G 00 12 03.3 +52 34 14           ~ 3 0
9 2MASX J00121892+5233460 G 00 12 18.9 +52 33 47           ~ 3 0
10 NVSS J001242+522717 Rad 00 12 42.170 +52 27 18.21           ~ 2 1
11 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2606 2
12 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 219 0
13 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 777 1
14 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1324 1
15 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 278 0
16 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4374 2
17 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3890 2
18 ICRF J160913.3+264129 Sy2 16 09 13.32076181 +26 41 29.0362080   19       ~ 213 0
19 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 578 1
20 NAME Sausage Cluster ClG 22 42 53.0 +53 01 05           ~ 173 0

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2021.08.03-10:01:39

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