2009A&A...507.1257G

Query : 2009A&A...507.1257G

2009A&A...507.1257G - Astronomy and Astrophysics, volume 507, 1257-1270 (2009/12-1)

Radio halos in nearby (z < 0.4) clusters of galaxies.

GIOVANNINI G., BONAFEDE A., FERETTI L., GOVONI F., MURGIA M., FERRARI F. and MONTI G.

Abstract (from CDS):

The intra-cluster medium is characterized by thermal emission, and by the presence of large scale magnetic fields. In some clusters of galaxies, a diffuse non-thermal emission is also present, located at the cluster center and called radio halo. These sources indicate the existence of relativistic particles and magnetic fields in the cluster volume. In this paper we collect data on all known nearby cluster radio halos (z<0.4), to discuss their statistical properties and to investigate their origin. We searched for published data on radio halos and reduced new and archive VLA data to increase the number of known radio halos. We present data on 31 radio halos, 1 new relic source, and 1 giant filament. We note the discovery of a small size diffuse radio emission in a cluster (A1213) with very low X-ray luminosity. Among the statistical results, we confirm the correlation between the average halo radio spectral index and the cluster temperature. We also discuss the high percentage of clusters where both a relic and a radio halo is present. The sample of radio halos discussed here represents the population of radio halos observable with current radio telescopes. A new telescope generation is necessary for a more detailed multifrequency study, and to investigate the possible existence of a population of radio halos with different properties.

Abstract Copyright: ∼

Journal keyword(s): galaxies: cluster: general - intergalactic medium - radio continuum: general

Simbad objects: 39

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Number of rows : 39
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 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 812 0
2 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 295 0
3 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 566 0
4 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 249 0
5 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 436 0
6 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 97 0
7 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 963 1
8 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 463 0
9 B3 0714+378 Rad 07 17 36.6 +37 45 01           ~ 170 2
10 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 437 0
11 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 253 0
12 ACO 754 ClG 09 09 08.4 -09 39 58           ~ 666 1
13 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 295 0
14 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 327 0
15 ACO 3444 ClG 10 23 53.1540 -27 15 07.840           ~ 87 0
16 ACO 1213 ClG 11 16 26.98 +29 16 23.9           ~ 151 0
17 4C 29.41 rG 11 16 34.6160545656 +29 15 17.112000564   15.02 14.90     ~ 126 1
18 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 151 0
19 ACO 1351 ClG 11 42 24.7795 +58 32 05.558           ~ 79 0
20 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 4798 2
21 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 102 0
22 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 251 2
23 NAME ACO 1758S GrG 13 32 32.8 +50 24 48           ~ 64 0
24 MCXC J1332.7+5032 ClG 13 32 44.8 +50 32 24           ~ 107 0
25 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 314 1
26 ACO 1914 ClG 14 26 03.32 +37 49 58.7           ~ 314 0
27 ZwCl 1447+2619 ClG 14 49 28.2 +26 07 57           ~ 50 0
28 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 130 0
29 ACO 2034 ClG 15 10 12.96 +33 29 53.2           ~ 215 1
30 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 562 0
31 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 809 1
32 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 359 0
33 ACO 2256 ClG 17 03 09.4 +78 39 36           ~ 885 1
34 ACO 2255 ClG 17 12 50.04 +64 03 10.6           ~ 568 0
35 ACO 2254 ClG 17 17 45.90 +19 40 22.8           ~ 69 0
36 ACO 2294 ClG 17 24 10.1 +85 53 09           ~ 63 0
37 ACO 2319 ClG 19 20 45.3 +43 57 43           ~ 461 1
38 ACT-CL J2003.5-2323 ClG 20 03 32.3 -23 23 30           ~ 59 0
39 ZwCl 2341+0000 ClG 23 43 40.566 +00 18 18.94           ~ 69 0

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