2000PASP..112..148D

Query : 2000PASP..112..148D

2000PASP..112..148D - Publ. Astron. Soc. Pac., 112, 148-162 (2000/February-0)

Diffuse X-ray emission in three poor clusters of galaxies.

DAHLEM M. and THIERING I.

Abstract (from CDS):

We report on ROSAT PSPC soft X-ray observations of three poor clusters of galaxies at distances above 100 Mpc (cz>8000 km.s–1). In all three cases the emission is centered on the dominant member of the cluster, i.e., NGC 4104, NGC 6269, and NGC 6329, respectively. X-ray emission was detected out to radii of 400-600 kpc. The bolometric X-ray luminosities range from 2.6 to 8.6x1042 ergs.s–1.

The soft X-ray emission characteristics and the physical properties deduced from our observations of all three poor clusters resemble those of downscaled rich clusters. In each case, the soft X-ray spectrum is well represented by a thermal model with kT≃1.1-1.3 keV and near-solar metallicity in the center, increasing to kT≃1.4-1.6 keV toward the outer boundaries while the metallicity, Z, decreases to about 0.1 solar. Equally good fits can be achieved if the metallicity is left at the solar value and an additional gas component with kT≃0.5 keV is introduced.

The central electron densities in all three poor clusters studied here are enhanced with respect to a King profile by factors of 2-6. This, together with the results of the spectral fits, can be interpreted as either indicating the presence of cooling flows or of a two-phase medium in the central areas.

The spatial electron density distribution in the outer regions of each cluster can be fitted by King profiles with core radii of 17-60 kpc and exponents of β=0.38-0.44. Using the derived radial temperature and density distributions, the total gravitating mass is obtained. We derive Mtot=3.7±0.7x1013 M☉ within a radius of 300 kpc for each of the three systems, as opposed to 1014-1015 M☉ for rich clusters.

We find that the LX versus kT relation found by A. C. Edge and G. C. Stewart (1991) for rich clusters of galaxies scales into the domain of poor clusters and groups of galaxies.

The spectral fits of the central regions show that none of the first-ranking galaxies of the three poor clusters hosts a Seyfert 1 active galactic nucleus that contributes significantly to the emission in the ROSAT band (0.1-2.4 keV).


Abstract Copyright: ∼

Journal keyword(s): Galaxies: Clusters: General - galaxies: clusters: individual (MKW 4s, AWM 5, NGC 6329) - Galaxies: Cooling Flows - Galaxies: Elliptical and Lenticular, cD - X-Rays

Nomenclature: Table 7: [DT2000] NGC 4104 NN (Nos 1-27). Table 8: [DT2000] NGC 6269 NN (Nos 1-17). Table 9: [DT2000] NGC 6329 NN (Nos 1-39).

Simbad objects: 107

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Number of rows : 107
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 HCG 16 CGG 02 09 40.82 -10 11 02.0           ~ 175 0
2 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
3 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
4 [VV2000] J120342.8+283556 Sy1 12 03 42.80 +28 35 56.0   18.01 17.79     ~ 11 0
5 ACO 1455 ClG 12 04 04.0 +28 07 08           ~ 56 0
6 QSO J1204+2754 Bla 12 04 42.1097215992 +27 54 11.869350264   15.64 15.60     ~ 429 0
7 NAME NGC 4073 Group GrG 12 04 44.08 +01 48 40.9     13.53     ~ 292 0
8 [DT2000] NGC 4104 11 X 12 04 46.0 +28 11 37           ~ 1 0
9 [DT2000] NGC 4104 24 X 12 05 05.2 +27 55 19           ~ 1 0
10 [DT2000] NGC 4104 6 X 12 05 38.7 +28 18 40           ~ 1 0
11 [DT2000] NGC 4104 21 X 12 05 58.1 +27 58 40           ~ 1 0
12 [DT2000] NGC 4104 20 X 12 06 01.9 +28 01 38           ~ 1 0
13 [DT2000] NGC 4104 1 X 12 06 05.2 +28 37 45           ~ 1 0
14 [DT2000] NGC 4104 3 X 12 06 05.7 +28 24 21           ~ 1 0
15 [DT2000] NGC 4104 18 X 12 06 14.7 +28 03 58           ~ 1 0
16 [VV2006] J120619.7+282253 Bla 12 06 19.6448265096 +28 22 54.637344228   19.47 19.25 19.2   ~ 36 1
17 NAME NGC 4104 Group GrG 12 06 19.75 +28 07 08.3           ~ 52 0
18 [DT2000] NGC 4104 9 X 12 06 30.2 +28 14 36           ~ 1 0
19 NGC 4104 rG 12 06 38.9098151088 +28 10 27.184493280   13.7 13.58     ~ 114 1
20 [DT2000] NGC 4104 26 X 12 07 00.1 +27 42 56           ~ 1 0
21 [DT2000] NGC 4104 17 X 12 07 02.7 +28 06 04           ~ 1 0
22 [DT2000] NGC 4104 16 X 12 07 15.2 +28 06 08           ~ 1 0
23 7C 1204+2811 Bla 12 07 27.90046635 +27 54 58.8497008     18.1 18.69   ~ 90 1
24 [DT2000] NGC 4104 15 X 12 07 33.9 +28 06 40           ~ 1 0
25 RX J1207.7+2736 X 12 07 44.6 +27 36 42           ~ 3 0
26 [DT2000] NGC 4104 10 ClG 12 07 47.2 +28 13 11           ~ 4 0
27 [VV2000] J120753.3+280239 QSO 12 07 54.6646757400 +28 02 59.901439632   18.34 18.10     ~ 20 0
28 [DT2000] NGC 4104 7 X 12 08 00.0 +28 17 38           ~ 1 0
29 [DT2000] NGC 4104 22 X 12 08 14.0 +27 55 33           ~ 1 0
30 [DT2000] NGC 4104 8 X 12 08 40.8 +28 15 53           ~ 1 0
31 [DT2000] NGC 4104 5 X 12 09 09.3 +28 21 36           ~ 1 0
32 1RXS J120914.1+280712 X 12 09 12.6 +28 06 43           ~ 1 0
33 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1126 1
34 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
35 NAME NGC 5044 Group GrG 13 14 22.7 -16 32 04           ~ 186 0
36 NGC 5044 BiC 13 15 23.9607836592 -16 23 07.547751744   11.9   10.74   ~ 531 0
37 ClG J1347-1145 ClG 13 47 30.5 -11 45 07           ~ 577 0
38 SDSS J165640.57+275256.9 Sy1 16 56 40.5644191632 +27 52 56.902665900   20.56 19.95     ~ 6 0
39 NGC 6263 rG 16 56 43.2083521152 +27 49 19.522731756   15.1       ~ 38 0
40 2MASS J16565850+2754454 QSO 16 56 58.4861021472 +27 54 45.407435688   18.49 18.13     ~ 29 0
41 1RXS J165659.3+280744 X 16 56 59.6 +28 07 35           ~ 1 0
42 [DT2000] NGC 6269 4 X 16 57 11.2 +27 55 58           ~ 1 0
43 NGC 6264 Sy2 16 57 16.1272966344 +27 50 58.574330124   15.5       ~ 123 1
44 1RXS J165724.9+275043 G 16 57 28.0 +27 50 56           ~ 1 0
45 NGC 6265 GiG 16 57 29.1136022304 +27 50 39.454733904   15.4       ~ 36 0
46 [DT2000] NGC 6269 13 X 16 57 38.0 +27 44 07           ~ 1 0
47 [DT2000] NGC 6269 12 X 16 57 48.0 +27 48 04           ~ 1 0
48 [DT2000] NGC 6269 8 G 16 57 56.9 +27 51 17           ~ 1 0
49 NGC 6269 rG 16 57 58.1011343880 +27 51 15.883449192   14.4 13.73     ~ 109 1
50 AWM 5 ClG 16 58 00.8 +27 51 16     14.00     ~ 66 0
51 [DT2000] NGC 6269 14 X 16 58 01.3 +27 43 13           ~ 1 0
52 [DT2000] NGC 6269 3 X 16 58 06.9 +27 58 47           ~ 1 0
53 [DT2000] NGC 6269 5 X 16 58 22.5 +27 55 31           ~ 1 0
54 [DT2000] NGC 6269 17 X 16 58 35.5 +27 36 47           ~ 1 0
55 2MASX J16585240+2739422 GiC 16 58 52.4118538776 +27 39 41.989912632   16.84       ~ 14 0
56 [DT2000] NGC 6269 16 X 16 59 04.9 +27 38 52           ~ 1 0
57 [DT2000] NGC 6269 2 X 16 59 13.5 +27 59 44           ~ 1 0
58 NVSS J171123+434842 Rad 17 11 23.292 +43 48 44.75           ~ 5 1
59 1RXS J171123.8+434903 Rad 17 11 27.5 +43 48 53           ~ 1 0
60 [DT2000] NGC 6329 33 X 17 12 00.6 +43 29 35           ~ 1 0
61 [DT2000] NGC 6329 31 X 17 12 13.4 +43 33 08           ~ 1 0
62 1RXS J171215.3+440305 Sy1 17 12 15.4710684766 +44 02 49.446425589     18.19     ~ 8 0
63 HD 155965 * 17 12 44.0623021848 +43 46 33.409368732   9.85 9.38     F8 9 0
64 [DT2000] NGC 6329 14 * 17 12 44.6 +43 46 24           ~ 1 0
65 [DT2000] NGC 6329 3 X 17 12 58.0 +44 08 47           ~ 1 0
66 [DT2000] NGC 6329 12 X 17 13 10.9 +43 48 45           ~ 1 0
67 SDSS J171320.52+433749.8 QSO 17 13 20.5300494066 +43 37 49.551916388           ~ 8 0
68 1RXS J171331.3+433702 X 17 13 31.6 +43 36 48           ~ 1 0
69 [DT2000] NGC 6329 2 X 17 13 36.7 +44 12 24           ~ 1 0
70 1RXS J171343.0+434535 X 17 13 41.0 +43 45 14           ~ 1 0
71 [DT2000] NGC 6329 32 X 17 13 43.8 +43 30 27           ~ 1 0
72 [DT2000] NGC 6329 34 X 17 13 58.8 +43 29 14           ~ 1 0
73 [DT2000] NGC 6329 17 X 17 14 02.7 +43 42 09           ~ 1 0
74 [DT2000] NGC 6329 36 X 17 14 03.1 +43 22 29           ~ 1 0
75 [DT2000] NGC 6329 30 X 17 14 07.8 +43 34 23           ~ 1 0
76 NAME NGC 6329 Group GrG 17 14 15 +43 41.1           ~ 9 0
77 NGC 6329 rG 17 14 15.0278110392 +43 41 04.900781508   14.3       ~ 41 1
78 [DT2000] NGC 6329 29 X 17 14 16.2 +43 35 16           ~ 1 0
79 [DT2000] NGC 6329 35 X 17 14 18.0 +43 23 36           ~ 1 0
80 [DT2000] NGC 6329 16 X 17 14 25.8 +43 43 26           ~ 1 0
81 [DT2000] NGC 6329 20 X 17 14 26.5 +43 40 54           ~ 1 0
82 [DT2000] NGC 6329 27 X 17 14 29.5 +43 36 10           ~ 1 0
83 [DT2000] NGC 6329 37 X 17 14 46.6 +43 14 17           ~ 1 0
84 [DT2000] NGC 6329 11 X 17 14 55.7 +43 49 13           ~ 1 0
85 1RXS J171459.4+433642 X 17 14 58.3 +43 36 19           ~ 1 0
86 [DT2000] NGC 6329 22 G 17 15 02.6 +43 39 26           ~ 1 0
87 [DT2000] NGC 6329 1 X 17 15 02.6 +44 29 17           ~ 1 0
88 NGC 6332 GiG 17 15 02.8963927272 +43 39 36.580900968   14.6       ~ 19 0
89 [DT2000] NGC 6329 9 X 17 15 06.6 +43 50 08           ~ 1 0
90 [DT2000] NGC 6329 25 X 17 15 07.3 +43 37 14           ~ 1 0
91 NVSS J171513+434056 Rad 17 15 13.50 +43 40 56.9           ~ 3 1
92 [DT2000] NGC 6329 7 X 17 15 15.2 +43 56 25           ~ 1 0
93 [VV2006] J171517.5+434112 QSO 17 15 17.4975562536 +43 41 11.097906468   19.10 18.79     ~ 13 0
94 [DT2000] NGC 6329 38 X 17 15 25.4 +43 07 36           ~ 1 0
95 1RXS J171532.5+434800 X 17 15 32.4 +43 47 48           ~ 1 0
96 [DT2000] NGC 6329 24 X 17 15 33.0 +43 37 47           ~ 1 0
97 1RXS J171555.3+434024 Rad 17 15 55.7 +43 40 05           ~ 1 0
98 6C 171425+434351 QSO 17 15 55.9859240760 +43 40 17.091970932     18.39     ~ 11 1
99 [DT2000] NGC 6329 8 X 17 15 59.2 +43 54 10           ~ 1 0
100 [DT2000] NGC 6329 4 X 17 16 08.1 +44 08 31           ~ 1 0
101 USNO-A2.0 1275-09269453 G 17 16 31.4073016272 +43 02 21.868859436   18.0   18.0   ~ 7 0
102 TYC 3081-510-1 Em* 17 16 32.7022900032 +43 02 28.824860580   11.65 10.88     G8 12 0
103 NVSS J171638+435716 rG 17 16 38.18281 +43 57 17.5507           ~ 5 1
104 [DT2000] NGC 6329 6 Rad 17 16 39.2 +43 57 01           ~ 1 0
105 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
106 NGC 6322 OpC 17 18 28.3 -42 56 39           ~ 68 0
107 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 480 1

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