2002/02/18 by R. Barrena, A. Biviano, M. Ramella +3 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics #Brightest cluster galaxy #Cluster (spacecraft) #Collision #Computer science #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Halo #Physics #Velocity dispersion #Virial mass #Virial theorem #astro-ph
paper · pdf · doi:10.1051/0004-6361:20020244
Accepted for publication on A&A
arxiv created 2002/02/18 · openalex publication_date 2002/05/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.