2008ApJ...679.1162J

Query : 2008ApJ...679.1162J

2008ApJ...679.1162J - Astrophys. J., 679, 1162-1172 (2008/June-1)

The hot gas halos of galaxies in groups.

JELTEMA T.E., BINDER B. and MULCHAEY J.S.

Abstract (from CDS):

We use Chandra observations of 13 nearby groups of galaxies to investigate the hot gas content of their member galaxies. We find that a large fraction of near-IR-bright, early-type galaxies in groups have extended X-ray emission, indicating that they retain significant hot gas halos even in these dense environments. In particular, we detect hot gas halos in ∼80% of LK>L*galaxies. We do not find a significant difference in the LK-LX relation for detected group and cluster early-type galaxies. However, we detect X-ray emission from a significantly higher fraction of galaxies brighter than L* in groups compared to clusters, indicating that a larger fraction of galaxies in clusters experience significant stripping of their hot gas. In addition, group and cluster galaxies appear to be X-ray-faint compared to field galaxies, although a Chandra-based field sample is needed to confirm this result. The near-IR-bright late-type galaxies in clusters and groups appear to follow the LK-LX relation for early-type galaxies, while near-IR-fainter late-type galaxies are significantly more X-ray luminous than this relation likely due to star formation. Finally, we find individual examples of ongoing gas stripping of group galaxies. One galaxy shows a 40-50 kpc X-ray tail, and two merging galaxy systems show tidal bridges/tails of X-ray emission. Therefore, stripping of hot galactic gas through both ram pressure and tidal forces does occur in groups and clusters, but the frequency or efficiency of such events must be moderate enough to allow hot gas halos in a large fraction of bright galaxies to survive even in group and cluster cores.

Abstract Copyright: ∼

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

CDS comments: NGC 4759NED01 = HCG 62b, T.2 and T.3 2MASS objects not identified (too short format)

Simbad objects: 63

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Number of rows : 63
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 375 AG? 01 07 05.9200285896 +32 20 53.197225548   16.5       ~ 55 0
2 NGC 379 GiG 01 07 15.7054600656 +32 31 13.619283852   14.0       ~ 76 1
3 NGC 380 GiG 01 07 17.6009811624 +32 28 58.449364788   13.9       ~ 85 1
4 NGC 382 GiP 01 07 23.87 +32 24 13.9   14.2       ~ 105 1
5 NGC 384 GiG 01 07 25.0135015920 +32 17 33.865906848   14.3       ~ 86 1
6 NGC 385 GiG 01 07 27.2301389736 +32 19 11.510553972   14.3       ~ 83 1
7 NAME NGC 383 Group GrG 01 07 27.7 +32 23 59   11.1 14.1     ~ 82 0
8 NGC 386 GiG 01 07 31.3075564632 +32 21 42.936872040   15.4       ~ 57 1
9 IC 1687 GiG 01 23 19.1497544928 +33 16 39.317500992   14.8       ~ 24 0
10 NGC 504 GiG 01 23 27.9067252392 +33 12 15.711056856   14.0       ~ 63 0
11 NGC 503 GiG 01 23 28.4252774184 +33 19 54.600192444   15.1       ~ 29 0
12 NGC 508 GiG 01 23 40.5740498304 +33 16 50.482644528   14.5       ~ 69 0
13 NAME NGC 507 Group GrG 01 23.7 +33 15           ~ 80 0
14 IC 1690 GiG 01 23 49.5358731528 +33 09 22.487618628   14.9       ~ 30 0
15 Z 502-72 GiG 01 23 58.5162902664 +33 18 47.698807248   15.0       ~ 27 0
16 NAME NGC 533 Group GrG 01 25 29.1 +01 48 17           ~ 57 0
17 MCG+01-06-002 GiG 01 56 12.0137782608 +05 35 18.892154328   15.0       ~ 26 0
18 IC 1751 GiG 01 56 19.0651553640 +05 39 07.740758340   15.1       ~ 30 0
19 NAME NGC 741 Group GrG 01 56 22 +05 37.6     14.3     ~ 52 0
20 NGC 742 GiP 01 56 24.1660196952 +05 37 36.049925676   14.8       ~ 54 0
21 NGC 833 Sy2 02 09 20.8490871072 -10 07 59.003785884   14.02 13.00 12.75   ~ 191 0
22 NGC 835 Sy2 02 09 24.606 -10 08 09.31   13.29 12.45 12.24   ~ 206 0
23 NGC 838 LIN 02 09 38.562 -10 08 46.12   13.72   12.65   ~ 195 0
24 HCG 16 CGG 02 09 40.82 -10 11 02.0           ~ 169 0
25 NGC 839 GiG 02 09 42.8 -10 11 02   13.98 11.42 12.70   ~ 151 0
26 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2255 1
27 MCG-03-26-006 GiG 10 00 10.2917665944 -19 37 18.674077584   14.56 13.36 12.86 12.04 ~ 49 0
28 HCG 42 CGG 10 00 13.1 -19 38 24           ~ 99 0
29 NGC 3096 GiG 10 00 33.1214332440 -19 39 42.939578196   14.08 13.09 13.03 11.75 ~ 48 0
30 NAME NGC 3557 Group ClG 11 09 57.4 -37 32 17           ~ 19 0
31 NGC 3564 EmG 11 10 36.3803064480 -37 32 51.219735648   13.31 12.21 11.67   ~ 57 0
32 NGC 3568 Sy1 11 10 48.5525122964 -37 26 51.850678068   13.01 12.58 11.61 12.5 ~ 81 0
33 UGC 6697 GiG 11 43 49.1088652488 +19 58 05.954438316 13.96 14.35 13.59 13.29   ~ 227 3
34 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1075 1
35 NGC 4063 GiG 12 04 05.9833668312 +01 50 49.125591348   15.0   13.875   ~ 47 0
36 2dFGRS TGN383Z237 GiG 12 04 18.9946650144 +01 50 54.144489156   15.3   14.469   ~ 37 0
37 NGC 4139 GiG 12 04 34.0236330696 +01 48 05.682841740   14.804   13.584   ~ 46 0
38 NGC 4075 GiG 12 04 37.8289419408 +02 04 21.131142744   14.439   13.276   ~ 31 0
39 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 280 0
40 NGC 4320 GiG 12 22 57.7226454312 +10 32 53.944450872   15.3       ~ 45 0
41 2MASX J12225813+1028400 GiC 12 22 58.1281917192 +10 28 39.628944624           ~ 12 0
42 NAME NGC 4325 Group GrG 12 23 18.2 +10 37 19           ~ 53 0
43 NGC 4759 GiG 12 53 04.66 -09 12 02.1   14.21   12.04   ~ 50 0
44 HCG 62 CGG 12 53 05.6 -09 12 21           ~ 306 0
45 NGC 4761 BiC 12 53 05.6960048016 -09 12 14.579980632   13.79   11.25   ~ 86 1
46 NAME NGC 5171 Group GrG 13 29 05.10 +11 45 04.8     4.7     ~ 74 0
47 ECO 11511 GiG 13 29 20.6634055008 +11 44 24.180686124           ~ 9 1
48 NGC 5171 GiG 13 29 21.5707210536 +11 44 06.389823624   14.7       ~ 58 0
49 LEDA 47341 GiG 13 29 22.5 +11 39 20   15.7       ~ 8 0
50 NGC 5177 EmG 13 29 24.2798258256 +11 47 49.369542036   15.4       ~ 40 0
51 NGC 5176 GiG 13 29 24.9659424024 +11 46 53.307080688   15.4       ~ 32 0
52 NGC 5179 LIN 13 29 30.9002483928 +11 44 44.876500152   14.9       ~ 51 0
53 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 296 2
54 2MASX J16565786+2754489 GiC 16 56 57.865 +27 54 48.98           ~ 3 0
55 NGC 6265 GiG 16 57 29.1136022304 +27 50 39.454733904   15.4       ~ 33 0
56 NGC 6269 GiG 16 57 58.1011343880 +27 51 15.883449192   14.4 13.73     ~ 104 0
57 AWM 5 ClG 16 58 00.8 +27 51 16     14.00     ~ 60 0
58 NGC 6270 GiC 16 58 31.608 +27 35 11.13   15       ~ 7 0
59 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 528 1
60 NGC 7173 GiP 22 02 03.1741852512 -31 58 25.338407412   12.10   10.59   ~ 136 0
61 HCG 90 CGG 22 02 06.3 -31 55 48           ~ 130 0
62 NGC 7174 GiP 22 02 06.45 -31 59 34.7   12.26 12.15 10.84   ~ 87 0
63 NGC 7176 GiP 22 02 08.4333223632 -31 59 23.446700592   12.08   10.59   ~ 124 0

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