Issue |
A&A
Volume 386, Number 3, May II 2002
|
|
---|---|---|
Page(s) | 816 - 828 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20020244 | |
Published online | 15 May 2002 |
The dynamical status of the cluster of galaxies 1E0657-56*
1
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
2
INAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34131 Trieste, Italy
3
Smithsonian Institution, F. L. Whipple Observatory, PO Box 97, 670 Mount Hopkins, Amado, AZ 85645, USA
4
Universitäts-Sternwarte, Scheinerstrasse 1, 81679 Muenchen, Germany
Corresponding author: A. Biviano, biviano@ts.astro.it
Received:
19
December
2001
Accepted:
12
February
2002
We present the results of a new spectroscopic and
photometric survey of the hot X-ray cluster
, at . We determine the presence
of a low velocity dispersion subcluster, which is offset
from the main cluster position by 0.7 Mpc and
600
km s-1. We determine the virial masses and total
luminosities of the cluster and its subcluster, and solve
for the two-body dynamical model. With additional
constraints from the results of the analysis of the
cluster X-ray emission by Markevitch et al.
([CITE]), we find that the subcluster passed
through the cluster centre
0.15 Gyr ago. Taken
at face value the mass of the subcluster is typical of a
loose group. It is however difficult to establish the
pre-merger mass of the colliding system. We provide
tentative evidence that the subcluster is in fact the
remnant core of a moderately massive cluster, stripped by
the collision with . The main cluster
dynamics does not seem to have suffered from this
collision. On the contrary, the cluster X-ray properties
seem to have been significantly affected. We also
discuss the effect of the subcluster collision in
relation to starburst events and the cluster radio halo.
Key words: galaxies: clusters: individual: 1E0657-56 / galaxies: clusters: general / galaxies: distances and redshifts
© ESO, 2002
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