2000PASP..112..148D


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.10CEST14:42:12

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 - 2021
#notes
1 HCG 16 CGG 02 09 40.82 -10 11 02.0           ~ 159 0
2 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1475 1
3 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 679 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           ~ 55 0
6 2E 2583 ClG 12 04 27.0 +01 53 45     13.93     ~ 34 0
7 2E 2584 Sy1 12 04 42.1097577213 +27 54 11.867990165   15.64 15.60     ~ 358 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 QSO 12 06 19.6444068315 +28 22 54.636026541   19.47 19.25 19.2   ~ 27 0
17 [DT2000] NGC 4104 9 X 12 06 30.2 +28 14 36           ~ 1 0
18 NGC 4104 BiC 12 06 38.9101632378 +28 10 27.174879883   13.7 13.58     ~ 91 1
19 NAME NGC 4104 Group GrG 12 06 48 +28 09.9           ~ 41 0
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 QSO 12 07 27.9005771543 +27 54 58.849630757     18.1 18.69   ~ 69 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 54.6647299841 +28 02 59.900068576   18.34 18.10     ~ 16 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 ~ 1022 1
34 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1989 2
35 NAME NGC 5044 Group GrG 13 14 22.7 -16 32 04           ~ 172 0
36 NGC 5044 BiC 13 15 23.969 -16 23 08.00   11.9   10.74   ~ 462 0
37 ClG J1347-1145 ClG 13 47 33.5 -11 45 42           ~ 488 0
38 SDSS J165640.57+275256.9 Sy1 16 56 40.5658249863 +27 52 56.914120132   20.56 19.95     ~ 6 0
39 NGC 6263 GiG 16 56 43.239 +27 49 19.96   15.1       ~ 34 0
40 3XMM J165658.4+275445 QSO 16 56 58.4857516590 +27 54 45.409522992   18.49 18.13     ~ 24 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 16.129 +27 50 58.55   15.5       ~ 97 1
44 1RXS J165724.9+275043 G 16 57 28.0 +27 50 56           ~ 1 0
45 NGC 6265 GiG 16 57 29.1134755317 +27 50 39.445875467   15.4       ~ 30 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 GiG 16 57 58.099 +27 51 15.72   14.4 13.73     ~ 98 0
50 NAME NGC 6269 Group ClG 16 58 00.8 +27 51 16     14.00     ~ 58 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 52.4115875321 +27 39 41.997898925   16.84       ~ 13 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 23.3 +43 48 45           ~ 4 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 X 17 12 15.27 +44 03 03.8           ~ 3 0
63 HD 155965 * 17 12 44.0628790312 +43 46 33.416073607   9.85 9.38     F8 4 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 3XMM J171320.5+433750 QSO 17 13 20.5300494066 +43 37 49.551916388           ~ 6 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 NGC 6329 GiG 17 14 15.000 +43 41 05.03   14.3       ~ 36 1
77 NAME NGC 6329 Group GrG 17 14 15 +43 41.1           ~ 9 0
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 02.8965980142 +43 39 36.580548141   14.6       ~ 16 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 13.40 +43 40 56.8           ~ 2 1
92 [DT2000] NGC 6329 7 X 17 15 15.2 +43 56 25           ~ 1 0
93 [VV2006] J171517.5+434112 QSO 17 15 17.4969860718 +43 41 11.090486902   19.10 18.79     ~ 10 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 55.9870615474 +43 40 17.079299592     18.39     ~ 10 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 31.4071860458 +43 02 21.864702698   18.0   18.0   ~ 7 0
102 TYC 3081-510-1 * 17 16 32.7025343548 +43 02 28.826529265   11.65 10.88     ~ 9 0
103 NVSS J171638+435716 Rad 17 16 38.2 +43 57 18           ~ 3 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     ~ 1935 0
106 NGC 6322 OpC 17 18 25 -42 56.0           ~ 52 0
107 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 380 1

    Equat.    Gal    SGal    Ecl

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2021.04.10-14:42:12

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