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

We present results from optical, X-ray and radio observations of two X-ray bright (L_X ~ 10⁴⁵ erg s^-1) galaxy clusters. Abell 1451 is at redshift z=0.1989 and has line-of-sight velocity dispersion sigma_v = 1330 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 z=0.2474 and sigma_v = 1100 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. Tables \ref{tab3} and \ref{tab4} and Figs. \ref{fig13} and \ref{fig14} are only available in electronic form at http://www.edpsciences.org