Abell 1451 and 1RXS J131423.6-251521: A multi-wavelength study of two dynamically perturbed clusters of galaxies^*

¹ CEA/DSM/DAPNIA, Service d'Astrophysique, 91191 Gif-sur-Yvette, France
² School of Physics, University of Sydney, NSW 2006, Australia

Corresponding author: I. Valtchanov, ivaltchanov@cea.fr

Received: 9 April 2002
Accepted: 20 June 2002

Abstract

We present results from optical, X-ray and radio observations of two X-ray bright ( erg s^-1) galaxy clusters. Abell 1451 is at redshift and has line-of-sight velocity dispersion km s^-1 as measured from 57 cluster galaxies. It has regular X-ray emission without signs of substructure, a Gaussian velocity distribution, lack of a cooling flow region and significant deviations from the observed scaling laws between luminosity, temperature and velocity dispersion, indicating a possible merging shock. There is only one spectroscopically confirmed cluster radio galaxy, which is close to the X-ray peak. 1RXS J131423.6-251521 (for short RXJ1314-25) has and km s^-1 from 37 galaxies. There are two distinct galaxy groups with a projected separation of ≈700 kpc. The velocity histogram is bi-modal with a redshift-space separation of ~1700 km s^-1, and the X-ray emission is double peaked. Although there are no spectroscopically confirmed cluster radio galaxies, we have identified a plausible relic source candidate.