2002ApJ...576..688B

Query : 2002ApJ...576..688B

2002ApJ...576..688B - Astrophys. J., 576, 688-707 (2002/September-2)

The soft X-ray emission in a large sample of galaxy clusters with the ROSAT position sensitive proportional counter.

BONAMENTE M., LIEU R., JOY M.K. and NEVALAINEN J.

Abstract (from CDS):

The study of soft X-ray emission of 38 X-ray-selected galaxy clusters observed by the ROSAT Position Sensitive Proportional Counter indicates that the ``soft excess'' phenomenon may be a common occurrence in galaxy clusters. Excess soft X-ray radiation, above the contribution from the hot intracluster medium, is evident in a large fraction of sources and is clearly detected with large statistical significance in the deepest observations. The investigation relies on new, high-resolution 21 cm H I observations. The sample selection also features analysis of infrared images to further ensure reliability of results with respect to the characteristics of Galactic absorption. The possibility of background or calibration effects as cause of the excess emission is likewise investigated; a detailed analysis of the distribution of the excess emission with respect to detector position and Galactic H I column density shows that the excess emission is a genuine celestial phenomenon. We find evidence for a preferential distribution of the soft excess emission at distances larger than ∼150-200 kpc from the centers of clusters; this behavior may be naturally explained in the context of a nonthermal inverse Compton scenario. Alternatively, we propose that the phenomenon may be caused by thermal emission of very large scale ``warm'' filaments seen in recent hydrodynamic simulations. This new interpretation relieves the very demanding requirements of either the traditional intracluster ``warm'' gas and the nonthermal scenarios. We also investigate the possibility of the soft excess originating from unresolved, X-ray-faint cluster galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - X-Rays: Galaxies: Clusters

CDS comments: In ACO 85: VSSRS = [BPL98] VSSRS, Radio2 = [BPL98] South Blob.

Simbad objects: 44

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Number of rows : 44
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 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 1077 0
3 ACO 21 ClG 00 20 38.75 +28 41 40.5           ~ 122 0
4 NVSS J004129-092240 Rad 00 41 30.99 -09 22 26.0           ~ 37 1
5 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
6 [BPL98] South Blob Rad 00 41 48 -09 27.5           ~ 4 0
7 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
8 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
9 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
10 ACO 3301 ClG 05 01 05.8 -38 43 58           ~ 44 0
11 ACO 665 ClG 08 30 45.2 +65 52 55           ~ 457 0
12 ACO 1045 ClG 10 34 52.19 +30 41 41.5           ~ 37 0
13 ACO 1068 ClG 10 40 47.1 +39 57 19           ~ 232 0
14 ACO 1302 ClG 11 33 12.02 +66 22 26.9           ~ 81 0
15 ACO 1314 ClG 11 34 53.0 +49 05 18           ~ 234 1
16 ACO 1361 ClG 11 43 45.85 +46 20 51.8           ~ 96 0
17 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
18 ACO 1413 ClG 11 55 12.87 +23 23 46.9           ~ 456 0
19 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
20 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
21 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
22 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
23 ACO 3560 ClG 13 32 23.7 -33 08 21           ~ 145 1
24 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
25 ACO 3571 ClG 13 47 32.4 -32 50 12           ~ 308 2
26 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
27 ACO 1914 ClG 14 25 57.4 +37 49 54           ~ 338 0
28 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 349 1
29 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
30 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
31 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
32 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 594 3
33 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
34 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
35 ACO 2219 ClG 16 40 22.1 +46 42 20           ~ 381 0
36 ACO 2241 ClG 16 59 42.58 +32 34 44.4           ~ 85 1
37 ACO 2244 ClG 17 02 40.33 +34 02 58.7           ~ 301 0
38 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
39 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
40 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1
41 ACO 2597 ClG 23 25 19.70 -12 07 27.7           ~ 572 0
42 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
43 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0
44 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1

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