For refcode 1993AJ....106.1301Z: Retrieve 65 NED objects in this reference. Please click here for ADS abstract
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1993AJ....106.1301Z
THE KINEMATICS OF DENSE CLUSTERS OF GALAXIES. II. THE DISTRIBUTION
OF VELOCITY DISPERSIONS
ANN I. ZABLUDOFF, MARGARET J. GELLER, JOHN P. HUCHRA, AND MASSIMO RAMELLA
HarvardSmithsonian Center for Astrophysics, Cambridge,
Massachusetts 02138
Electronic mail: aiz@libra.ociw.edu, mjg@cfa.harvard.edu,
huchra@cfa.harvard.edu, ramella@cfa.harvard.edu
Received 1993 March 18 revised 1993 May 21
ABSTRACT
From the survey of 31 Abell R >= 1 cluster fields within 0.02 <= z <=0.05
[Zabludoff et al., AJ, 106, 1273 (1993)] we extract 25 dense clusters
with velocity dispersions {sigma} > 300 km s^1^ and with number
densities exceeding the mean for the Great Wall of galaxies [Geller &
Huchra, Science, 246, 897, (1989)) by one deviation. From the CfA
Redshift Survey (Huchra et al. 1993, in preparation), we obtain an
approximately volumelimited catalog of 31 groups with velocity
dispersions > 100 km s^1^ and with the same number density limit. We
combine these welldefined samples to obtain the distribution of cluster
velocity dispersions. The group sample enables us to correct for
incompleteness in the Abell catalog at low velocity dispersions. The
clusters from the Abell cluster fields populate the high dispersion tail.
For systems with velocity dispersions > 700 km s^1^, approximately the
median for R = 1 clusters [Zabludoff et al., ApJS, 74, 1(1990)], the
group and cluster abundances are consistent. The cumulative distributions
of dispersions for clusters with {sigma} > 700 km s^1^ and for groups
are exponential laws of the form proportional to 10^n{sigma}^, n ~
0.0015. The combined distribution is consistent with cluster xray
temperature functions [Edge et al., MNRAS, 245, 559(1990), and Henry &
Arnaud, ApJ, 372, 410 (1991)].
Retrieve 65 NED objects in this reference. Please click here for ADS abstract
