2001AJ....122.2858O


Query : 2001AJ....122.2858O

2001AJ....122.2858O - Astron. J., 122, 2858-2873 (2001/December-0)

Dynamics of cD clusters of galaxies. IV. Conclusion of a survey of 25 Abell clusters.

OEGERLE W.R. and HILL J.M.

Abstract (from CDS):

We present the final results of a spectroscopic study of a sample of cD galaxy clusters. The goal of this program has been to study the dynamics of the clusters, with emphasis on determining the nature and frequency of cD galaxies with peculiar velocities. Redshifts measured with the MX Spectrometer have been combined with those obtained from the literature to obtain typically 50-150 observed velocities in each of 25 galaxy clusters containing a central cD galaxy. We present a dynamical analysis of the final 11 clusters to be observed in this sample. All 25 clusters are analyzed in a uniform manner to test for the presence of substructure and to determine peculiar velocities and their statistical significance for the central cD galaxy. These peculiar velocities were used to determine whether or not the central cD galaxy is at rest in the cluster potential well. We find that 30%-50% of the clusters in our sample possess significant subclustering (depending on the cluster radius used in the analysis), which is in agreement with other studies of non-cD clusters. Hence, the dynamical state of cD clusters is not different than that of other present-day clusters. After careful study, four of the clusters appear to have a cD galaxy with a significant peculiar velocity. Dressler-Shectman tests indicate that three of these four clusters have statistically significant substructure within 1.5 h–175 Mpc of the cluster center. The dispersion of the cD peculiar velocities is 164+41–34 km.s–1 around the mean cluster velocity. This represents a significant detection of peculiar cD velocities but at a level that is far below the mean velocity dispersion for this sample of clusters. The picture that emerges is one in which cD galaxies are nearly at rest with respect to the cluster potential well but have small residual velocities due to subcluster mergers.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - galaxies: clusters: individual (A779, A1691) - galaxies: clusters: individual (A1749) - galaxies: clusters: individual (A1767) - galaxies: clusters: individual (A1837) - galaxies: clusters: individual (A1927) - galaxies: clusters: individual (A2061) - galaxies: clusters: individual (A2067) - galaxies: clusters: individual (A2079) - galaxies: clusters: individual (A2089) - galaxies: clusters: individual (A2199, A2666) - Galaxies: Elliptical and Lenticular, cD - Galaxies: Kinematics and Dynamics

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ACO 85 ClG 00 41 37.8 -09 20 33           ~ 841 0
2 ACO 193 ClG 01 25 07.3 +08 41 36           ~ 179 0
3 ACO 399 ClG 02 57 56.4 +13 00 59           ~ 370 0
4 ACO 401 ClG 02 58 56.9 +13 34 56           ~ 538 0
5 ACO 779 ClG 09 19 48.0 +33 45 32           ~ 247 0
6 ACO 1651 ClG 12 59 22.43 -04 11 47.1           ~ 277 0
7 ACO 1691 ClG 13 11 11.14 +39 16 38.4           ~ 93 0
8 ACO 1749 ClG 13 29 32 +37 37.5           ~ 61 0
9 ACO 1767 ClG 13 36 08.33 +59 12 23.0           ~ 162 0
10 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1202 0
11 ACO 1809 ClG 13 53 03.72 +05 08 17.7           ~ 159 0
12 ACO 1837 ClG 14 01 36.2 -11 07 48           ~ 101 0
13 ACO 1927 ClG 14 31 06.2 +25 38 15           ~ 93 0
14 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 893 0
15 ACO 2052 ClG 15 16 45.5 +07 00 01           ~ 702 1
16 ACO 2061 ClG 15 21 20.58 +30 40 15.3           ~ 172 1
17 ACO 2063 ClG 15 23 01.8 +08 38 22           ~ 379 2
18 ACO 2067 ClG 15 23 14 +30 54.4           ~ 103 1
19 ACO 2079 ClG 15 28 04.7 +28 52 40           ~ 137 0
20 ACO 2089 ClG 15 32 35.9 +28 01 07           ~ 102 0
21 ACO 2107 ClG 15 39 47.9 +21 46 21           ~ 240 0
22 ACO 2124 ClG 15 44 59.3 +36 03 40           ~ 198 0
23 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1129 1
24 ACO 2634 ClG 23 38 18.4 +27 01 37           ~ 491 2
25 ACO 2666 ClG 23 50 56.2 +27 08 41           ~ 203 0
26 ACO 2670 ClG 23 54 13.64 -10 25 08.7           ~ 342 0

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2022.06.30-06:20:57

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