2002A&A...396...31C

Query : 2002A&A...396...31C

2002A&A...396...31C - Astronomy and Astrophysics, volume 39631-51 (2002/12-2)

First gamma-rays from galaxy clusters. Preliminary evidence of the association of galaxy clusters with EGRET unidentified gamma-ray sources.

COLAFRANCESCO S.

Abstract (from CDS):

The vast majority of the celestial gamma-ray sources detected so far have not yet been identified with secure counterparts at other wavelenghts. Here we report preliminary evidence for an association between galaxy clusters and unidentified gamma-ray sources of high galactic latitude (|b|>20°) in the Third EGRET catalog. All of the clusters which are most probably associated with EGRET sources show evidence of strong radio emission either because they host radio galaxies/sources in their environments or because they have a radio halo or relic inhabiting their intracluster medium. The cluster radio emission suggests that the relativistic particles (electrons, protons), which are diffusing in the intracluster medium, might be also responsible for their gamma-ray emission. Beyond the spatial associations of clusters with unidentified EGRET sources, we found a correlation between the radio flux at 1.4GHz of the cluster's brightest source and the gamma-ray flux, F(>100MeV), of the associated EGRET source. For the most probable EGRET-cluster associations we also found a further correlation between the X-ray luminosity of galaxy clusters and the gamma-ray luminosity of the associated gamma-ray source under the hypothesis that the EGRET sources have the same cluster redshifts. Such correlations are consistent with the theoretical expectations and strengthen the probability of a true, physical association between galaxy clusters and gamma-ray sources.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: observation, theory - galaxies: clusters: general - galaxies: active

CDS comments: rG 1474+380 is a misprint for 1424+380.

Simbad objects: 57

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Number of rows : 57
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 [VV2006] J003906.3-094247 QSO 00 39 06.29166353 -09 42 46.8896508   21.40 20.87     ~ 62 1
2 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
3 2EG J0159-3557 gam 01 59 21.6 -36 03 36           ~ 16 2
4 ACO 2963 ClG 02 00 45 -35 59.5           ~ 6 0
5 ACO S 219 ClG 02 02 03.36 -35 48 34.0           ~ 6 0
6 ACO 331 ClG 02 15 35 +11 21.9           ~ 7 0
7 GRO J0215+11 gam 02 16 00.0 +11 22 48           ~ 21 0
8 ACO 388 ClG 02 51 36 -03 45.7           ~ 7 0
9 3EG J0253-0345 gam 02 56 13.1 -04 08 02           ~ 11 0
10 ACO 3164 ClG 03 46 16.8 -57 02 11           ~ 47 0
11 3EG J0348-5708 gam 03 48 28.8 -57 08 24           ~ 7 0
12 ACO 497 ClG 04 36 51 +10 38.0           ~ 9 0
13 3EG J0439+1105 gam 04 39 14.4 +11 05 24           ~ 8 0
14 ACO S 573 ClG 06 12 02 -32 57.8           ~ 3 0
15 ACO S 575 ClG 06 13 25 -33 40.9           ~ 3 0
16 PSR J0614-3329 Psr 06 14 10.3479 -33 29 54.116           ~ 134 1
17 ACO S 577 ClG 06 15 18 -34 07.0           ~ 3 0
18 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
19 RX J1211.9+2242 BLL 12 11 58.6306591752 +22 42 32.946579432   19.13 18.66 18.7   ~ 51 0
20 ACO 1494 ClG 12 13 14 +23 56.3           ~ 6 0
21 PSR J1231-1411 Psr 12 31 11.3069 -14 11 43.628           ~ 139 0
22 ACO 1555 ClG 12 31 59 -13 23.6           ~ 14 0
23 ACO 1558 ClG 12 34 00 -13 34.5           ~ 10 0
24 3EG J1235+0233 gam 12 35 +02.6           ~ 12 0
25 ACO 1564 ClG 12 35 01.95 +01 47 54.4           ~ 35 0
26 PMN J1310-0452 Bz? 13 10 13.0360275192 -04 52 08.669920800           ~ 22 1
27 ACO 1688 ClG 13 11 29.37 -04 40 55.6           ~ 10 0
28 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 266 2
29 NVSS J133253+503137 rG 13 32 52.9193654568 +50 31 46.039341036   20.54   18.26   ~ 15 1
30 ICRF J133353.7+505735 Bla 13 33 53.7823 +50 57 35.914   20.09 19.71 19.6   ~ 91 1
31 LEDA 1877944 LIN 13 41 59.7261690312 +29 46 53.532135768   16.68       ~ 33 0
32 ACO 1781 ClG 13 45 32.70 +29 31 49.6           ~ 67 0
33 2EG J1346+2942 gam 13 47 12.0 +29 32 24           ~ 21 0
34 ACO 1902 ClG 14 21 39.7 +37 17 43           ~ 67 0
35 MAPS-NGP O-272-323568 ClG 14 21 40 +37 17.5           ~ 1 0
36 FIRST J142140.4+371731 rG 14 21 40.466 +37 17 30.41   16.3       ~ 10 0
37 87GB 142101.3+375014 BLL 14 23 04.6147460592 +37 37 30.571082328   19.08 18.66 18.3   ~ 53 1
38 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
39 4C 38.39 rG 14 26 05.87 +37 48 58.1           ~ 29 1
40 3EG J1447-3936 gam 14 47 48.0 -39 36 36           ~ 6 0
41 ACO S 774 ClG 14 49 07.2718 -40 19 39.095           ~ 7 0
42 PMN J1449-3957 Rad 14 49 52.49 -39 57 32.7           ~ 4 1
43 ACO 2163 ClG 16 15 46.1 -06 08 50           ~ 586 0
44 ClG J1720+2638 ClG 17 20 09.6 +26 37 35           ~ 284 0
45 GRO J1731-78 gam 18 25 02.4 -79 26 24     14.20     ~ 12 0
46 ACO 3631 ClG 18 34 08 -78 47.8           ~ 5 0
47 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
48 3EG J2034-3110 gam 20 34 55.2 -31 10 48           ~ 11 0
49 ACO S 886 ClG 20 37 11 -31 38.5           ~ 2 0
50 3EG J2219-7941 gam 22 20 00.0 -79 41 24           ~ 6 0
51 ACO S 1014 ClG 22 24 10 -80 10.8           ~ 4 0
52 ACO S 1024 ClG 22 27 32 -78 45.7           ~ 3 0
53 ACO 2486 ClG 22 48 45 +17 09.9           ~ 7 0
54 NVSS J225032+174915 Bla 22 50 32.7567295767 +17 49 14.907644163           ~ 35 1
55 3EG J2255-5012 gam 22 56 -50.2           ~ 6 0
56 ACO S 1073 ClG 22 56 02 -50 22.0           ~ 2 0
57 ACO S 1074 ClG 22 58 07 -49 40.9           ~ 2 0

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