Scaling and structure of clusters with XMM-Newton
Abstract
XMM-Newton observations of two-dimensional distribution of gas properties in clusters of galaxies reveal a significant amount of substructure. We identify the entropy to be most sensitive to both late stage of merger with the associated slow buoyancy action on relaxation of the cluster and on the scale of strong shocks, which change the entropy. The pressure maps are much more regular and thus could be used to infer the the dark matter distribution. Putting groups and clusters of galaxies on scaling relations for entropy and pressure, we identify high scatter amoung the groups as well as presence of the low entropy gas at outskirts of clusters as most challenging issues for using these systems as simple cosmology probes.
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35..264F