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

Full paper

View the references in ADS

Number of rows : 39

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2024	#notes
1	ACO 2744	ClG	00 14 20.03	-30 23 17.8			~	765	0
2	ACO 209	ClG	01 31 52.9	-13 36 53			~	291	0
3	ACO 401	ClG	02 58 56.9	+13 34 56			~	557	0
4	ACO 521	ClG	04 54 08.6	-10 14 39			~	242	0
5	ACO 520	ClG	04 54 10.1	+02 55 38			~	431	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			~	943	1
8	B3 0714+378	Rad	07 17 36.50	+37 45 23.0			~	169	2
9	ClG J0717+3745	ClG	07 17 36.50	+37 45 23.0			~	458	0
10	ACO 665	ClG	08 30 45.2	+65 52 55			~	433	0
11	ACO 697	ClG	08 42 57.6	+36 21 45			~	251	0
12	ACO 754	ClG	09 09 08.4	-09 39 58			~	664	1
13	ACO 773	ClG	09 17 51.3	+51 43 20			~	292	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			~	83	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			~	149	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			~	4730	2
21	BAX 199.3086-25.5133	ClG	13 14 25.4	-25 15 44			~	101	0
22	ACO 1758	ClG	13 32 32.1	+50 30 37			~	245	2
23	NAME ACO 1758S	GrG	13 32 32.8	+50 24 48			~	62	0
24	MCXC J1332.7+5032	ClG	13 32 44.8	+50 32 24			~	103	0
25	ACO 3562	ClG	13 33 31.8	-31 40 23			~	309	1
26	ACO 1914	ClG	14 26 03.32	+37 49 58.7			~	310	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			~	129	0
29	ACO 2034	ClG	15 10 12.96	+33 29 53.2			~	212	1
30	ACO 2163	ClG	16 15 46.1	-06 08 50			~	555	0
31	ACO 2218	ClG	16 35 54.0	+66 13 00			~	804	1
32	ACO 2219	ClG	16 40 22.1	+46 42 20			~	355	0
33	ACO 2256	ClG	17 03 09.4	+78 39 36			~	878	1
34	ACO 2255	ClG	17 12 50.04	+64 03 10.6			~	559	0
35	ACO 2254	ClG	17 17 45.90	+19 40 22.8			~	66	0
36	ACO 2294	ClG	17 24 10.1	+85 53 09			~	62	0
37	ACO 2319	ClG	19 20 45.3	+43 57 43			~	457	1
38	ACT-CL J2003.5-2323	ClG	20 03 32.3	-23 23 30			~	58	0
39	ZwCl 2341+0000	ClG	23 43 40.566	+00 18 18.94			~	68	0

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