Heating of the ICM and cluster scaling relations
Abstract
Hydrostatic polytropic models of the intracluster medium (ICM) are presented that simultaneously explain several observed departures from predictions of basic hierarchical clustering by adding an excess heat of 3.5 keV per particle at the cluster center. This conforms with nucleosynthetic constraints derived from ICM Si measurements, if the energy injection is centrally concentrated. I argue that most of the heating occurred during the assembly of the cluster, not exclusively in pre-collapse, proto-cluster fragments.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- 1999
- DOI:
- 10.1002/1521-3994(199908)320:4/5<193::AID-ASNA193>3.0.CO;2-O
- Bibcode:
- 1999AN....320..193L