2009A&A...506.1083V

Query : 2009A&A...506.1083V

2009A&A...506.1083V - Astronomy and Astrophysics, volume 506, 1083-1094 (2009/11-2)

Radio observations of ZwCl 2341.1+0000: a double radio relic cluster.

VAN WEEREN R.J., ROETTGERING H.J.A., BAGCHI J., RAYCHAUDHURY S., INTEMA H.T., MINIATI F., ENSSLIN T.A., MARKEVITCH M. and ERBEN T.

Abstract (from CDS):

Hierarchal models of large-scale structure (LSS) formation predict that galaxy clusters grow via gravitational infall and mergers of smaller subclusters and galaxy groups. Diffuse radio emission, in the form of radio halos and relics, is found in clusters undergoing a merger, indicating that shocks or turbulence associated with the merger are capable of accelerating electrons to highly relativistic energies. Double relics are a rare class of radio sources found in the periphery of clusters, with the two components located symmetrically on the opposite sides of the cluster center. These relics are important probes of the cluster periphery as (i) they provide an estimate of the magnetic field strength, and (ii) together with detailed modeling can be used to derive information about the merger geometry, mass, and timescale. Observations of these double relics can thus be used to test the framework of LSS formation. Here we report on radio observations of ZwCl 2341.1+0000, a complex merging structure of galaxies located at z=0.27, using Giant Metrewave Radio Telescope (GMRT) observations. The main aim of the observations is to study the nature of the diffuse radio emission in the galaxy cluster ZwCl 2341.1+0000. We carried out GMRT 610, 241, and 157MHz continuum observations of ZwCl 2341.1+0000. The radio observations are combined with X-ray and optical data of the cluster. The GMRT observations show a double peripheral radio relic in the cluster ZwCl 2341.1+0000. The spectral index is -0.49±0.18 for the northern relic and -0.76±0.17 for the southern relic. We have derived values of 0.48-0.93µGauss for the equipartition magnetic field strength. The relics are probably associated with outward traveling merger shock waves.

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Journal keyword(s): radio continuum: galaxies - galaxies: active - galaxies: clusters: individual: ZwCl 2341.1+0000 - cosmology: large-scale structure of Universe

Nomenclature: Table 2, Fig. 2: [VRB2009b] A (Nos A-L), [VRB2009b] RWN (Nos RN, RS), [VRB2009b] RW-N (Nos RS-1 to RS-3).

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 QSO B0023-263 BLL 00 25 49.15629900 -26 02 12.6141092   20.30 19.5 18.084   ~ 161 1
2 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2813 2
3 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 249 0
4 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1493 1
5 ACO 3376 ClG 06 01 25.000 -39 59 51.00           ~ 305 0
6 ACO 1240 ClG 11 23 37.7 +43 03 28           ~ 98 0
7 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 102 0
8 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4339 2
9 NVSS J142023-054532 rG 14 20 23.809 -05 45 28.56       19.65 18.44 ~ 20 0
10 ACO 2140 ClG 15 56 34 +48 39.4           ~ 4 0
11 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
12 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 567 0
13 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 627 1
14 ACO 2345 ClG 21 27 05.391 -12 09 07.41           ~ 131 0
15 NVSS J212709-120958 Rad 21 27 09.5 -12 09 58           ~ 132 1
16 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 830 1
17 [VRB2009b] F Rad 23 43 34.60 +00 20 36.5           ~ 1 0
18 [VRB2009b] RN Rad 23 43 35.0 +00 21 00           ~ 2 0
19 [VRB2009b] E Rad 23 43 36.20 +00 20 51.0           ~ 1 0
20 [VRB2009b] A Rad 23 43 39.30 +00 18 43.6           ~ 2 0
21 [VRB2009b] B Rad 23 43 40.30 +00 20 52.8           ~ 2 0
22 ZwCl 2341+0000 ClG 23 43 40.566 +00 18 18.94           ~ 69 0
23 [VRB2009b] C Rad 23 43 40.70 +00 20 29.3           ~ 1 0
24 [VRB2009b] G Rad 23 43 45.80 +00 16 05.8           ~ 2 0
25 [VRB2009b] H Rad 23 43 46.00 +00 15 33.5           ~ 1 0
26 [VRB2009b] L Rad 23 43 47.90 +00 14 00.4           ~ 1 0
27 [VRB2009b] I Rad 23 43 48.60 +00 15 06.5           ~ 1 0
28 [VRB2009b] J Rad 23 43 48.70 +00 15 30.9           ~ 1 0
29 [VRB2009b] K Rad 23 43 49.60 +00 15 05.5           ~ 1 0
30 [VRB2009b] RS Rad 23 43 50.0 +00 14 20           ~ 2 0
31 [VRB2009b] RS-2 Rad 23 43 50.0 +00 14 20           ~ 2 0
32 [VRB2009b] RS-1 Rad 23 43 50.0 +00 14 20           ~ 2 0
33 [VRB2009b] D Rad 23 43 50.10 +00 22 39.7           ~ 1 0
34 [VRB2009b] RS-3 Rad 23 43 52.0 +00 16 15           ~ 2 0

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