Issue |
Astron. Astrophys. Suppl. Ser.
Volume 131, Number 2, August 1998
|
|
---|---|---|
Page(s) | 221 - 227 | |
DOI | https://doi.org/10.1051/aas:1998263 | |
Published online | 15 August 1998 |
Kinematics of the southern galaxy cluster Abell 3733*,**
1
Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E–08028 Barcelona, Spain
2
Departament d'Enginyeria Informàtica, Universitat Rovira i Virgili, Carretera de Salou S/M, E–43006 Tarragona, Spain
Send offprint request to: J.M. Solanes
Received:
16
January
1998
Accepted:
2
March
1998
We report radial velocities for 99 galaxies with projected positions
within 30′ of the center of the cluster A3733 obtained with the
MEFOS multifiber spectrograph at the 3.6-m ESO telescope. These
measurements are combined with 39 redshifts previously published by
Stein (1996) to build a collection of 112 galaxy redshifts in the field
of A3733, which is used to examine the kinematics and structure of this
cluster. We assign cluster membership to 74 galaxies with heliocentric
velocities in the interval
. From this sample
of cluster members, we infer a heliocentric systemic velocity for A3733
of
, which implies a mean cosmological
redshift of 0.0380, and a velocity dispersion of
. The application of statistical substructure tests to a
magnitude-limited subset of the latter sample reveals evidence of
non-Gaussianity in the distribution of ordered velocities in the form
of lighter tails and possible multimodality. Spatial substructure tests
do not find, however, any significant clumpiness in the plane of the
sky, although the existence of subclustering along the line-of-sight
cannot be excluded.
Key words: galaxies: clusters: individual: A 3733 / galaxies: distances and redshifts
© European Southern Observatory (ESO), 1998