Volume 386, Number 3, May II 2002
|Page(s)||816 - 828|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 May 2002|
The dynamical status of the cluster of galaxies 1E0657-56*
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, firstname.lastname@example.org
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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