2002ApJ...573L..91M

Query : 2002ApJ...573L..91M

2002ApJ...573L..91M - Astrophys. J., 573, L91-L94 (2002/July-2)

Chandra observations of unresolved X-ray sources around two clusters of galaxies.

MOLNAR S.M., HUGHES J.P., DONAHUE M. and JOY M.

Abstract (from CDS):

We have searched for unresolved X-ray sources in the vicinity of two rich clusters of galaxies, Abell 1995 (A1995) and MS 0451.6-0305 (MS 0451), using the Chandra X-Ray Observatory. We detected significantly more unresolved sources around A1995 than expected based on the number of X-ray sources to the same flux limit detected in deep Chandra observations of blank fields. Previous studies have also found excess X-ray sources in the vicinity of several nearby clusters of galaxies using ROSAT and recently in more distant (z~0.5) clusters (RX J0030 and 3C 295) using Chandra. In contrast, we detect only 14 unresolved X-ray sources near MS 0451, which is consistent with the number expected from a cluster-free background. We determine the luminosity functions of the extra sources under the assumption that they are at the distance of their respective clusters. The characteristic luminosity of the extra sources around A1995 must be an order of magnitude fainter than that of the extra sources around RX J0030 and 3C 295. The apparent lack of extra sources around MS 0451 is consistent with its greater distance and the same characteristic luminosity as the A1995 sources. Hardness ratios suggest that, on average, the extra sources in A1995 may have harder spectra than those of RX J0030 and 3C 295. These results indicate that different classes of objects may dominate in different clusters, perhaps depending on the formation history and/or dynamical state of the accompanying cluster.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: Individual: Name: Abell 1995 - Galaxies: Clusters: Individual: Alphanumeric: MS 0451.6-0305 - X-Rays: Galaxies: Clusters

CDS comments: Tables 1 and 2 : incorrect format. Read : Table 1 : J14MMSS.s+DDMMSS, table 2 : J04MMSS.s-03MMSS

Simbad objects: 52

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Number of rows : 52
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 ClG J0030+2618 ClG 00 30 33.6 +26 18 16           ~ 65 0
2 ACO 194 ClG 01 26 01.3 -01 22 02           ~ 363 2
3 2MASS J04535566-0304082 * 04 53 55.6350026472 -03 04 08.409728316           ~ 1 0
4 CNOC MS 0451 102040 Sy1 04 53 56.4 -02 58 37           ~ 6 0
5 CNOC MS 0451 100645 Sy2 04 53 56.8 -03 02 25           ~ 7 0
6 CXOU J045404.1-030403 X 04 54 04.19 -03 04 03.7           ~ 1 0
7 CXOU J045406.7-030412 X 04 54 06.70 -03 04 12.3           ~ 1 0
8 CXOU J045408.5-030521 X 04 54 08.57 -03 05 21.2           ~ 1 0
9 CXOU J045410.8-030125 X 04 54 10.88 -03 01 25.8           ~ 8 0
10 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 368 0
11 CXOU J045412.8-030047 X 04 54 12.81 -03 00 47.5           ~ 8 0
12 CXOU J045419.2-030521 X 04 54 19.20 -03 05 21.2           ~ 1 0
13 [VV2006] J045419.7-030419 QSO 04 54 19.6247968632 -03 04 19.946424396           ~ 5 0
14 CXOU J045421.3-030132 X 04 54 21.39 -03 01 32.4           ~ 1 0
15 CXOU J045421.9-025816 X 04 54 21.95 -02 58 16.2           ~ 1 0
16 [VV2006] J045422.6-030034 QSO 04 54 22.5651137016 -03 00 34.940094336           ~ 4 0
17 CXOU J045424.7-025849 X 04 54 24.75 -02 05 49.8           ~ 1 0
18 CXOU J045426.0-030013 X 04 54 26.07 -03 00 13.2           ~ 1 0
19 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
20 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4
21 CXOU J145228.2+575954 X 14 52 28.20 +57 59 54.5           ~ 1 0
22 CXOU J145229.5+580418 X 14 52 29.56 +58 04 18.2           ~ 1 0
23 IRAS F14511+5816 EmG 14 52 30.8828038440 +58 04 47.973561060           ~ 8 0
24 CXOU J145231.0+580010 X 14 52 31.03 +58 00 10.9           ~ 1 0
25 CXOU J145233.2+580559 X 14 52 33.22 +58 05 59.2           ~ 1 0
26 CXOU J145233.5+580456 X 14 52 33.56 +58 04 56.3           ~ 1 0
27 CXOU J145234.4+575904 X 14 52 34.49 +57 59 04.0           ~ 1 0
28 CXOU J145235.7+580656 X 14 52 35.73 +58 06 56.1           ~ 1 0
29 CXOU J145242.5+580159 X 14 52 42.50 +58 01 59.1           ~ 1 0
30 CXOU J145244.0+580203 X 14 52 44.00 +58 02 03.3           ~ 1 0
31 CXOU J145245.5+580519 X 14 52 45.50 +58 05 19.5           ~ 1 0
32 CXOU J145246.3+580059 X 14 52 46.31 +58 00 59.7           ~ 1 0
33 2MASS J14524875+5802551 * 14 52 48.7444658568 +58 02 55.137105096           ~ 1 0
34 CXOU J145251.9+580046 G 14 52 52.024 +58 00 45.89   23.46   21.36   ~ 2 0
35 CXOU J145253.6+580020 X 14 52 53.64 +58 00 20.3           ~ 1 0
36 ACO 1995 ClG 14 52 55.0 +58 02 59           ~ 140 0
37 CXOU J145255.1+580056 X 14 52 55.19 +58 00 56.0           ~ 1 0
38 CXOU J145301.8+580005 X 14 53 01.83 +58 00 05.7           ~ 1 0
39 CXOU J145305.4+580033 X 14 53 05.45 +58 00 33.9           ~ 1 0
40 SDSS J145305.86+580308.6 QSO 14 53 05.8591677072 +58 03 08.570068704   19.4   19.2   ~ 12 0
41 CXOU J145307.1+580205 X 14 53 07.10 +58 02 05.8           ~ 1 0
42 CXOU J145308.7+580313 X 14 53 08.70 +58 03 13.8           ~ 1 0
43 CXOU J145313.2+580126 X 14 53 13.22 +58 01 26.9           ~ 1 0
44 CXOU J145315.4+580448 X 14 53 15.41 +58 04 48.5           ~ 1 0
45 CXOU J145315.5+580117 X 14 53 15.55 +58 01 17.4           ~ 1 0
46 CXOU J145316.7+575928 X 14 53 16.75 +57 59 28.6           ~ 1 0
47 CXOU J145317.4+580003 X 14 53 17.46 +58 00 03.0           ~ 1 0
48 CXOU J145319.1+580134 X 14 53 19.11 +58 01 34.4           ~ 1 0
49 CXOU J145322.0+575858 X 14 53 22.04 +57 58 58.7           ~ 1 0
50 CXOU J145324.6+580318 X 14 53 24.68 +58 03 18.4           ~ 1 0
51 SDSS J145327.61+580338.9 QSO 14 53 27.616 +58 03 38.92           ~ 3 0
52 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1

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