2007ApJ...670L...5B

Query : 2007ApJ...670L...5B

2007ApJ...670L...5B - Astrophys. J., 670, L5-L8 (2007/November-3)

Cosmic rays and radio halos in galaxy clusters: new constraints from radio observations.

BRUNETTI G., VENTURI T., DALLACASA D., CASSANO R., DOLAG K., GIACINTUCCI S. and SETTI G.

Abstract (from CDS):

Clusters of galaxies are sites of acceleration of charged particles and sources of nonthermal radiation. We report on new constraints on the population of cosmic rays in the intracluster medium (ICM) obtained via radio observations of a fairly large sample of massive, X-ray-luminous galaxy clusters in the redshift interval 0.2-0.4. The bulk of the observed galaxy clusters does not show any hint of megaparsec-scale synchrotron radio emission at the cluster center (radio halo). We obtained solid upper limits to the diffuse radio emission and discuss their implications for the models for the origin of radio halos. Our measurements allow us to also derive a limit to the content of cosmic-ray protons in the ICM. Assuming spectral indices of these protons δ=2.1-2.4 and µG level magnetic fields, as from rotation measures, these limits are 1 order of magnitude deeper than present EGRET upper limits, while they are less stringent for steeper spectra and lower magnetic fields.

Abstract Copyright: ∼

Journal keyword(s): Acceleration of Particles - Galaxies: Clusters: General - Radiation Mechanisms: Nonthermal - Radio Continuum: General - X-Rays: General

Simbad objects: 18

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Number of rows : 18
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 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
2 ACO 209 ClG 01 31 52.9 -13 36 53           ~ 326 0
3 ACO 521 ClG 04 54 08.6 -10 14 39           ~ 279 0
4 ACO 545 ClG 05 32 24.4152 -11 32 35.080           ~ 102 0
5 ACO 697 ClG 08 42 57.6 +36 21 45           ~ 277 0
6 ACO 773 ClG 09 17 51.3 +51 43 20           ~ 308 0
7 ACO 3444 ClG 10 23 53.1540 -27 15 07.840           ~ 97 0
8 ACO 1300 ClG 11 32 00.7 -19 53 34           ~ 168 0
9 ACO 1682 ClG 13 06 49.7 +46 32 59           ~ 149 1
10 BAX 199.3086-25.5133 ClG 13 14 25.4 -25 15 44           ~ 118 0
11 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
12 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
13 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
14 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
15 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
16 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1
17 ACT-CL J2003.5-2323 ClG 20 03 32.3 -23 23 30           ~ 63 0
18 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2

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