Weak Merging scenario of the CLASH Cluster A209

Abstract

We study the structural and dynamical properties of Abell 209 based on Chandra and XMM-Newton observations. We obtain detailed temperature, pressure and entropy maps with the contour binning method, and find a hot region in the NW direction. The X-ray brightness residual map and corresponding temperature profiles reveal a possible shock front in the NW direction and a cold front feature in the SE direction. Combing with the galaxy luminosity density map we propose a weak merger scenario. A young sub-cluster passing from the SE to NW direction could explain the optical subpeak, the ICM temperature map, the X-ray surface brightness excess, and the X-ray peak offset togethe.