1996A&A...310...31M

Query : 1996A&A...310...31M

1996A&A...310...31M - Astronomy and Astrophysics, volume 31031-48 (1996/6-1)

The ESO Nearby Abell Cluster Survey. II. The distribution of velocity dispersions of rich galaxy clusters.

MAZURE A., KATGERT P., DEN HARTOG R., BIVIANO A., DUBATH P., ESCALERA E., FOCARDI P., GERBAL D., GIURICIN G., JONES B., LE FEVRE O., MOLES M., PEREA J. and RHEE G.

Abstract (from CDS):

The ESO Nearby Abell Cluster Survey (the ENACS) has yielded 5634 redshifts for galaxies in the directions of 107 rich, Southern clusters selected from the ACO catalogue (Abell et al. 1989). By combining these data with another 1000 redshifts from the literature, of galaxies in 37 clusters, we construct a volume-limited sample of 128 RACO≥1 clusters in a solid angle of 2.55sr centered on the South Galactic Pole, out to a redshift z=0.1. For a subset of 80 of these clusters we can calculate a reliable velocity dispersion, based on at least 10 (but very often between 30 and 150) redshifts. We deal with the main observational problem that hampers an unambiguous interpretation of the distribution of cluster velocity dispersions, namely the contamination by fore- and background galaxies. We also discuss in detail the completeness of the cluster samples for which we derive the distribution of cluster velocity dispersions. We find that a cluster sample which is complete in terms of the field-corrected richness count given in the ACO catalogue gives a result that is essentially identical to that based on a smaller and more conservative sample which is complete in terms of an intrinsic richness count that has been corrected for superposition effects. We find that the large apparent spread in the relation between velocity dispersion and richness count (based either on visual inspection or on machine counts) must be largely intrinsic; i.e. this spread is not primarily due to measurement uncertainties. One of the consequences of the (very) broad relation between cluster richness and velocity dispersion is that all samples of clusters that are defined complete with respect to richness count are unavoidably biased against low-σV clusters. For the richness limit of our sample this bias operates only for velocity dispersions less than ≃800km/sec. We obtain a statistically reliable distribution of global velocity dispersions which, for velocity dispersions σV>800km/s, is free from systematic errors and biases. Above this value of σV our distribution agrees very well with the most recent determination of the distribution of cluster X-ray temperatures, from which we conclude that β=σV2 µmH/kTX≃1. The observed distribution n(>σV), and especially its high-σV tail above ≃800km/s, provides a reliable and discriminative constraint on cosmological scenarios for the formation of structure. We stress the need for model predictions that produce exactly the same information as do the observations, namely dispersions of line-of-sight velocity of galaxies within the turn-around radius and inside a cylinder rather than a sphere, for a sample of model clusters with a richness limit that mimics that of the sample of observed clusters.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters of - galaxies: redshifts - cosmology: observations - dark matter

VizieR on-line data: <Available at CDS (J/A+A/310/31): table1a table1b>

Simbad objects: 155

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Number of rows : 155
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 ACO 2717 ClG 00 03 12.9 -35 56 13           ~ 146 0
2 ACO 2715 ClG 00 03 20.67 -34 26 59.3           ~ 28 0
3 ACO 2734 ClG 00 11 21.60 -28 51 16.6           ~ 156 0
4 ACO 13 ClG 00 13 38.5 -19 30 19           ~ 107 1
5 ACO 2755 ClG 00 17 41.14 -35 12 01.0           ~ 42 1
6 ACO 2764 ClG 00 20 27 -49 13.3           ~ 32 0
7 ACO 2765 ClG 00 21 32.29 -20 45 25.3           ~ 13 0
8 ACO 2778 ClG 00 29 46.29 -30 15 24.2           ~ 21 0
9 ACO 2799 ClG 00 37 28.1 -39 08 59           ~ 40 0
10 ACO 2800 ClG 00 37 58 -25 05.5           ~ 41 0
11 ACO 74 ClG 00 38 53 -22 18.5           ~ 41 0
12 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
13 ACO 87 ClG 00 43 01 -09 47.6           ~ 46 0
14 ACO 2819 ClG 00 45 51.1 -63 34 42           ~ 34 1
15 ACO 118 ClG 00 55 43.9 -26 24 46           ~ 44 0
16 ACO 119 ClG 00 56 08.57 -01 12 00.8           ~ 577 2
17 ACO 126 ClG 00 59 47 -14 12.8           ~ 37 0
18 ACO 2854 ClG 01 00 46.20 -50 31 24.7           ~ 31 2
19 ACO 133 ClG 01 02 41.5 -21 52 53           ~ 391 1
20 ACO 2871 ClG 01 08 04.1 -36 47 03           ~ 32 0
21 ACO 151 ClG 01 08 52.3 -15 25 01           ~ 199 1
22 ACO 2889 ClG 01 14 45 -48 30.1           ~ 13 0
23 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
24 ACO 2911 ClG 01 26 12.9 -37 56 22           ~ 63 0
25 ACO 2915 ClG 01 28 57.00 -29 00 41.4           ~ 18 0
26 ACO 2923 ClG 01 31 50.60 -31 23 43.4           ~ 23 0
27 ACO 229 ClG 01 39 25 -03 37.8           ~ 25 0
28 ACO 2933 ClG 01 40 41.2 -54 33 26           ~ 28 0
29 ACO 261 ClG 01 51 26 -02 14.2           ~ 46 0
30 ACO 2954 ClG 01 54 28.86 -71 28 02.3           ~ 11 0
31 ACO 277 ClG 01 55 50.5 -07 24 17           ~ 42 0
32 ACO 2955 ClG 01 57 01.9 -17 01 29           ~ 13 0
33 ACO 295 ClG 02 02 27 -01 04.6           ~ 67 0
34 ACO 303 ClG 02 06 13 -03 18.7           ~ 16 0
35 ACO 3009 ClG 02 22 07 -48 34.4           ~ 18 0
36 ACO 367 ClG 02 36 36.0 -19 22 16           ~ 52 0
37 ACO 3040 ClG 02 40 07 -55 25.2           ~ 5 0
38 ACO 380 ClG 02 45 19.44 -26 24 58.1           ~ 24 0
39 ACO 415 ClG 03 06 47 -12 02.5           ~ 63 0
40 ACO 420 ClG 03 09 17 -11 31.6           ~ 25 0
41 ACO 3093 ClG 03 10 52.0 -47 23 43           ~ 34 0
42 ACO 423 ClG 03 11 17 -12 06.7           ~ 36 0
43 ACO 3094 ClG 03 11 25.00 -26 55 52.2           ~ 64 0
44 ACO 3108 ClG 03 15 14 -47 38.0           ~ 18 0
45 ACO 3107 ClG 03 15 24.9 -42 44 13           ~ 15 0
46 ACO 3111 ClG 03 17 49.3 -45 42 24           ~ 38 0
47 ACO 3112 ClG 03 17 52.9 -44 15 06           ~ 329 1
48 ACO 3122 ClG 03 22 10.9 -41 20 15           ~ 62 0
49 ACO 3126 ClG 03 28 43.7 -55 42 44           ~ 64 0
50 ACO 3128 ClG 03 29 50.6 -52 34 48           ~ 183 3
51 ACO 3135 ClG 03 34 03.7 -39 00 49           ~ 37 0
52 ACO 3142 ClG 03 36 42 -39 48.2           ~ 42 0
53 ACO 3141 ClG 03 36 49.4 -28 04 53           ~ 29 0
54 ACO 3144 ClG 03 37 23.1 -55 06 18           ~ 33 0
55 ACO 3152 ClG 03 40 22 -32 34.4           ~ 12 0
56 ACO 3151 ClG 03 40 27.2 -28 40 20           ~ 45 0
57 ACO 3153 ClG 03 40 56.7 -34 16 29           ~ 14 2
58 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
59 ACO 3194 ClG 03 59 12 -30 10.5           ~ 28 0
60 ACO 3202 ClG 04 00 14 -53 39.6           ~ 28 0
61 ACO 3223 ClG 04 08 34.5 -30 49 08           ~ 59 2
62 ACO 484 ClG 04 16 19 -07 39.6           ~ 25 0
63 ACO 3264 ClG 04 31 19.3 -49 17 38           ~ 15 0
64 ACO 3266 ClG 04 31 26.4 -61 25 17           ~ 447 0
65 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
66 ACO 500 ClG 04 38 55.0 -22 05 55           ~ 89 0
67 ACO 514 ClG 04 48 18 -20 28.7           ~ 149 0
68 ACO 524 ClG 04 57.8 -19 43           ~ 25 0
69 ACO 3301 ClG 05 01 05.8 -38 43 58           ~ 44 0
70 ACO 3330 ClG 05 14 47.4 -49 04 19           ~ 36 2
71 ACO 3334 ClG 05 17 58 -58 32.9           ~ 20 0
72 ACO 3341 ClG 05 25 31.859 -31 35 56.05           ~ 57 0
73 ACO 543 ClG 05 30 36.1584 -22 27 33.665           ~ 34 0
74 ACO 3351 ClG 05 31 42.3 -38 19 34           ~ 11 0
75 ACO 3354 ClG 05 34 39 -28 30.1           ~ 22 0
76 ACO 3360 ClG 05 40 18.8 -43 23 31           ~ 29 0
77 ACO 548 ClG 05 47 01.7 -25 36 59           B8 209 2
78 ACO 3365 ClG 05 48 12 -21 56.1           ~ 41 0
79 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
80 ACO 957 ClG 10 14 02.35 -00 53 30.0           ~ 225 2
81 ACO 978 ClG 10 20 26.66 -06 31 37.5           ~ 126 1
82 ACO 1069 ClG 10 39 54.3 -08 36 40           ~ 116 1
83 ACO 3528 ClG 12 54 18.2 -29 01 16           ~ 166 1
84 ACO 3558 ClG 13 28 03.2 -31 31 35           ~ 476 2
85 ACO 3559 ClG 13 29 53.9 -29 31 29           ~ 74 0
86 ACO 3562 ClG 13 33 31.8 -31 40 23           ~ 337 1
87 ACO 1809 ClG 13 53 07.68 +05 08 32.7           ~ 179 0
88 ACO 2040 ClG 15 12 44.00 +07 27 34.5           ~ 144 1
89 ACO 2048 ClG 15 15 14.11 +04 23 10.4           ~ 109 0
90 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
91 ACO 3651 ClG 19 52 10.9 -55 05 16           ~ 74 0
92 ACO 3667 ClG 20 12 33.68 -56 50 26.3           ~ 676 1
93 ACO 3677 ClG 20 26 21 -33 21.1           ~ 28 0
94 ACO 3682 ClG 20 29 13.11 -36 57 45.1           ~ 16 0
95 ACO 3691 ClG 20 34 08.03 -38 01 45.5           ~ 20 0
96 ACO 3693 ClG 20 34 22.0 -34 29 40           ~ 46 0
97 ACO 3695 ClG 20 34 47.7 -35 49 39           ~ 96 2
98 ACO 3696 ClG 20 35 10 -34 54.6           ~ 17 1
99 ACO 3698 ClG 20 35 58 -25 16.6           ~ 31 0
100 ACO 3703 ClG 20 40 50.7 -61 12 49           ~ 22 0
101 ACO 3705 ClG 20 41 47.1 -35 10 30           ~ 47 0
102 ACO 3716 ClG 20 51 16.7 -52 41 43           ~ 123 1
103 ACO 3733 ClG 21 01 50.0 -28 06 54           ~ 64 3
104 ACO 3744 ClG 21 07 13.8 -25 28 54           ~ 80 1
105 ACO 3764 ClG 21 25 55.1 -34 43 28           ~ 28 0
106 ACO 2353 ClG 21 34 22.1 -01 34 33           ~ 27 0
107 ACO 3781 ClG 21 34 37 -66 50.6           ~ 14 0
108 ACO 3795 ClG 21 38 52.54 -32 04 19.2           ~ 12 0
109 ACO 2361 ClG 21 39 07 -14 19.4           ~ 35 0
110 ACO 2362 ClG 21 40 43 -14 16.3           ~ 37 0
111 ACO 3799 ClG 21 41 38 -72 43.3           ~ 10 0
112 ACO 2377 ClG 21 45 56.4 -10 06 33           ~ 59 0
113 ACO 3806 ClG 21 46 37.9 -57 17 07           ~ 59 0
114 ACO 3809 ClG 21 46 57.5 -43 54 06           ~ 99 0
115 ACO 2382 ClG 21 51 57.2984 -15 36 48.067           ~ 122 0
116 ACO 2384 ClG 21 52 20.9 -19 32 53           ~ 117 0
117 ACO 3822 ClG 21 54 06.2 -57 50 49           ~ 98 0
118 ACO 2399 ClG 21 57 19.01 -07 50 57.5           ~ 197 0
119 ACO 2400 ClG 21 57 46 -11 22.7           ~ 39 0
120 ACO 3825 ClG 21 58 22.4 -60 23 39           ~ 66 0
121 ACO 2401 ClG 21 58 22.6 -20 06 13           ~ 71 0
122 ACO 3826 ClG 21 59 54 -56 09.6           ~ 16 1
123 ACO 3827 ClG 22 01 49.1 -59 57 15           ~ 178 0
124 ACO 2410 ClG 22 02 15.8 -09 50 10           ~ 65 0
125 ACO 2420 ClG 22 10 22.5 -12 11 13           ~ 126 0
126 ACO 3844 ClG 22 13 30 -34 45.1           ~ 12 0
127 ACO 2426 ClG 22 14 27.3 -10 22 05           ~ 91 0
128 ACO 3864 ClG 22 20 09.1 -52 28 01           ~ 38 0
129 ACO 2436 ClG 22 20 27.1 -02 47 34           ~ 17 0
130 ACO 3879 ClG 22 27.8 -69 02           ~ 29 0
131 2MASX J22274915-6901238 BiC 22 27 49.1188452360 -69 01 24.191317272   16.42       ~ 19 0
132 ACO 2462 ClG 22 39 17.3 -17 22 23           ~ 96 0
133 ACO 2480 ClG 22 46 04 -17 41.2           ~ 36 0
134 ACO 3911 ClG 22 46 22.6 -52 44 21           ~ 73 0
135 ACO 3921 ClG 22 49 59.0 -64 25 48           ~ 165 1
136 ACO 2492 ClG 22 50 22.7 -19 15 24           ~ 21 0
137 ACO 2500 ClG 22 53 46.37 -25 30 00.0           ~ 24 0
138 ACO 2502 ClG 22 55 03 -16 33.0           ~ 13 0
139 ACO 3969 ClG 23 05 37 -44 08.8           ~ 9 0
140 ACO 2528 ClG 23 05 40.1 -21 23 47           ~ 24 0
141 ACO 2538 ClG 23 08 35.1 -19 52 29           ~ 56 0
142 ACO 2556 ClG 23 13 03.3 -21 37 40           ~ 83 0
143 ACO 2559 ClG 23 13 07 -13 41.7           ~ 35 0
144 ACO 2566 ClG 23 16 03.2 -20 27 41           ~ 50 0
145 ACO 2569 ClG 23 17 54 -12 51.6           ~ 31 0
146 ACO 2599 ClG 23 26 43.9 -23 50 53           ~ 21 0
147 ACO 4008 ClG 23 30 17 -39 19.4           ~ 26 0
148 ACO 4010 ClG 23 31 10.3 -36 30 26           ~ 63 0
149 ACO 2638 ClG 23 40 29.04 -11 42 21.8           ~ 33 0
150 ACO 2644 ClG 23 41 05 +00 05.3           ~ 41 0
151 ACO 4038 ClG 23 47 31.1 -28 12 10           ~ 349 3
152 ACO 2670 ClG 23 54 10.51 -10 23 06.8           ~ 364 0
153 ACO 4053 ClG 23 54 45.43 -27 40 52.6           ~ 39 0
154 ACO 4059 ClG 23 57 02.2 -34 45 58           ~ 400 1
155 ACO 4067 ClG 23 58 49.9 -60 37 25           ~ 55 0

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