Mass and Gas Profiles in A1689: Joint X-ray and Lensing Analysis

Understand

We carry out a comprehensive joint analysis of high quality HST/ACS and Chandra measurements of A1689, from which we derive mass, temperature, X-ray emission and abundance profiles.

• The X-ray emission is smooth and symmetric, and the lensing mass is centrally concentrated indicating a relaxed cluster.
• Assuming hydrostatic equilibrium we deduce a 3D mass profile that agrees simultaneously with both the lensing and X-ray measurements.
• However, the projected temperature profile predicted with this 3D mass profile exceeds the observed temperature by ~30% at all radii, a level of discrepancy comparable to the level found for other relaxed clusters.