2009A&A...507..661B

Query : 2009A&A...507..661B

2009A&A...507..661B - Astronomy and Astrophysics, volume 507661-669 (2009/11-4)

On the evolution of giant radio halos and their connection with cluster mergers.

BRUNETTI G., CASSANO R., DOLAG K. and SETTI G.

Abstract (from CDS):

Giant radio halos are diffuse, Mpc-scale, synchrotron sources located in the central regions of galaxy clusters and provide the most relevant example of cluster non-thermal activity. Radio and X-ray surveys allow to investigate the statistics of radio halos and may contribute to constrain the origin of these sources and their evolution. We investigate the distribution of clusters in the plane X-ray (thermal, LX) vs. synchrotron (non-thermal, P1.4) luminosity, where clusters hosting giant radio halos trace the P1.4-LX correlation and clusters without radio halos populate a region that is well separated from that spanned by the above correlation. The connection between radio halos and cluster mergers suggests that the cluster Mpc-scale synchrotron emission is amplified during these mergers and then suppressed when clusters become more dynamically relaxed. In this context, by analysing the distribution in the P1.4-LX plane of galaxy clusters from X-ray selected samples with adequate radio follow up, we constrain the typical time-scale of evolution of diffuse radio emission in clusters and discuss the implications for the origin of radio halos. We conclude that cluster synchrotron emission is suppressed (and amplified) in a time-scale significantly smaller than 1Gyr. We show that this constraint appears difficult to reconcile with the hypothesis that the halo's radio power is suppressed due to dissipation of magnetic field in galaxy clusters. On the other hand, in agreement with models where turbulent acceleration plays a role, present constraints suggest that relativistic electrons are accelerated in Mpc-scale regions, in connection with cluster mergers and for a time-interval of about 1Gyr, and then they cool in a relatively small time-scale, when the hosting cluster becomes more dynamically relaxed.

Abstract Copyright: ∼

Journal keyword(s): radio continuum: general - X-rays: general - radiation mechanisms: non-thermal - acceleration of particles - galaxies: clusters: general

Simbad objects: 46

goto Full paper

goto View the references in ADS

Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 2697 ClG 00 03 11.5 -06 05 30           ~ 53 0
2 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
3 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 517 0
4 BAX 006.9575+26.2739 ClG 00 27 45.90 +26 16 25.0           ~ 44 0
5 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
6 ACO 141 ClG 01 05 37.183 -24 40 49.95           ~ 87 0
7 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
8 ACO 3088 ClG 03 07 02.12 -28 39 57.3           ~ 78 0
9 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
10 ACO 520 ClG 04 54 10.1 +02 55 38           ~ 465 0
11 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 102 0
12 ClG 0657-56 ClG 06 58 26.9 -55 58 21           ~ 1077 1
13 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 511 0
14 B3 0714+378 Rad 07 17 36.6 +37 45 01           ~ 170 2
15 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
16 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
17 ZwCl 0857+2107 ClG 09 00 36.90 +20 53 40.3           ~ 103 0
18 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
19 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
20 ACO 781 ClG 09 20 25.4 +30 30 07           ~ 167 0
21 ZwCl 0949+5207 ClG 09 52 49.1 +51 53 05           ~ 141 0
22 ZwCl 1113+0144 ClG 11 15 54.0 +01 29 44           ~ 42 0
23 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 168 0
24 ACO 1423 ClG 11 57 17.3206 +33 36 39.364           ~ 181 0
25 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
26 ZwCl 1303+2647 ClG 13 05 58.0 +26 30 53   20.1       ~ 31 0
27 ZwCl 1309+2216 ClG 13 11.5 +22 00           ~ 26 0
28 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 118 0
29 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
30 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
31 ACO S 780 ClG 14 59 29.1 -18 10 45           ~ 93 0
32 ZwCl 1459+4240 ClG 15 01 23.0 +42 20 47           ~ 61 0
33 1RXS J151247.3-012753 X 15 12 47.3 -01 27 53           ~ 2 0
34 ClG J1532+3021 ClG 15 32 53.8 +30 21 00           ~ 122 0
35 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
36 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
37 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
38 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
39 ACO 2254 ClG 17 17 45.90 +19 40 22.8           ~ 79 0
40 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1
41 ACT-CL J2003.5-2323 ClG 20 03 32.3 -23 23 30           ~ 63 0
42 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
43 BAX 337.1433+20.6131 ClG 22 28 32.6 +20 37 08           ~ 132 0
44 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 152 0
45 ACO 2631 ClG 23 37 40.7 +00 16 35           ~ 183 0
46 ACO 2667 ClG 23 51 39.37 -26 05 02.7           ~ 190 0

To bookmark this query, right click on this link: simbad:objects in 2009A&A...507..661B and select 'bookmark this link' or equivalent in the popup menu