2000MNRAS.315..356H

Query : 2000MNRAS.315..356H

2000MNRAS.315..356H - Mon. Not. R. Astron. Soc., 315, 356-370 (2000/June-3)

The intragroup medium in loose groups of galaxies.

HELSDON S.F. and PONMAN T.J.

Abstract (from CDS):

We have used the ROSAT PSPC to study the properties of a sample of 24 X-ray-bright galaxy groups, representing the largest sample examined in detail to date. Hot plasma models are fitted to the spectral data to derive temperatures, and modified King models are used to characterize the surface brightness profiles.

In agreement with previous work, we find evidence for the presence of two components in the surface brightness profiles. The extended component is generally found to be much flatter than that observed in galaxy clusters, and there is evidence that the profiles follow a trend with system mass. We derive relationships between X-ray luminosity, temperature and optical velocity dispersion. The relation between X-ray luminosity and temperature is found to be LX∝T4.9, which is significantly steeper than the same relation in galaxy clusters. These results are in good agreement with pre-heating models, in which galaxy winds raise the internal energy of the gas, inhibiting its collapse into the shallow potential wells of poor systems.


Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): galaxies: clusters: general - intergalactic medium - X-rays: galaxies

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 NAME NGC 7819 Group GrG 00 02.5 +31 27           ~ 10 0
2 NGC 7819 GiG 00 04 24.495 +31 28 19.30   14.3       ~ 134 0
3 NAME NGC 43 Group GrG 00 14 +31.0           ~ 6 0
4 NAME PSC CL ClG 00 58 25.0 +30 39 11           ~ 131 1
5 NAME NGC 383 Group GrG 01 07 27.7 +32 23 59   11.1 14.1     ~ 85 0
6 NAME NGC 524 Group GrG 01 24 01.6 +09 27 37   11.2       ~ 34 0
7 NAME NGC 533 Group GrG 01 25 29.1 +01 48 17           ~ 57 0
8 NAME NGC 741 Group GrG 01 56 22 +05 37.6     14.3     ~ 54 0
9 NAME NGC 1587 Group GrG 04 30 46.1 +00 24 25   12.1       ~ 21 0
10 NGC 2563 GiG 08 20 35.6870161656 +21 04 04.111020012   13.7 12.39     ~ 163 1
11 NAME NGC 2563 Group GrG 08 20 39.46 +21 04 45.6           ~ 41 0
12 NGC 2769 LIN 09 10 32.1422359800 +50 25 59.688064848   13.8       ~ 56 0
13 HCG 42 CGG 10 00 13.1 -19 38 24           ~ 100 0
14 NAME NGC 3607 Group GrG 11 17 55.9 +18 07 35   9.9       ~ 57 0
15 NAME NGC 3665 Group GrG 11 23 30.6 +38 43 31   11.2       ~ 26 1
16 HCG 58 CGG 11 42 09.4 +10 16 30   11.8 13.68     ~ 82 1
17 NAME NGC 4065 Group GrG 12 04 04.94 +20 14 48.4   12.2       ~ 29 0
18 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
19 WBB N79-299 GrG 12 05 51.2 +20 32 19     14.7     ~ 12 1
20 NAME NGC 4168 Group GrG 12 12.0 +13 24           ~ 69 0
21 NAME NGC 4261 Group GrG 12 20 02.3 +05 20 24     12.9     ~ 43 0
22 NGC 4325 BiC 12 23 06.662 +10 37 16.45   15.0       ~ 140 1
23 NAME NGC 4325 Group GrG 12 23 18.2 +10 37 19           ~ 55 0
24 NAME NGC 4360 Group GrG 12 26 +09.1   13.0       ~ 4 0
25 NAME NGC 4615 Group GrG 12 41 15.0 +26 13 33           ~ 12 0
26 NGC 4615 EmG 12 41 37.3165133424 +26 04 22.103980284   13.8       ~ 135 0
27 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 570 0
28 HCG 62 CGG 12 53 05.6 -09 12 21           ~ 313 0
29 NGC 5129 LIN 13 24 10.0256041224 +13 58 35.575742748   13.3       ~ 134 1
30 BAX 201.0418+13.9765 ClG 13 24 11.9 +13 58 45           ~ 86 0
31 NAME NGC 5129 Group GrG 13 24 36.0 +13 55 40           ~ 38 0
32 NAME NGC 5171 Group GrG 13 29 05.10 +11 45 04.8     4.7     ~ 78 0
33 HCG 68 CGG 13 53 40.9 +40 19 07     12.4     ~ 114 0
34 NAME NGC 5386 Group GrG 13 58.7 +06 34   12.2       ~ 8 0
35 NAME NGC 5775 Group GrG 14 54 +03.6   11.4       ~ 10 0
36 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25           ~ 165 0
37 NAME M 102 Group GrG 15 06 29 +55 45.7           ~ 18 0
38 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2
39 NAME NGC 5970 Group GrG 15 36.3 +12 00   11.7       ~ 9 0
40 NAME NGC 6338 Group GrG 17 15 32.47 +57 25 19.0           ~ 95 0
41 HCG 90 CGG 22 02 06.3 -31 55 48           ~ 133 0
42 NAME NGC 7448 Group GrG 23 01 48.9 +15 58 09   11.3       ~ 24 1
43 NAME NGC 7619 Group GrG 23 20 32.1 +08 22 26           ~ 48 0
44 NAME NGC 7777 Group GrG 23 53 33.0 +28 34 42           ~ 12 0

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