Distribution of dark and baryonic matter in clusters of galaxies

¹ Dpto. Física Teórica y del Cosmos, Universidad de Granada, Avda. Fuentenueva s/n, 18071 Granada, Spain
² Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead CH41 1LD, UK
³ Institut für Astrophysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria

Corresponding author: A. Castillo-Morales, acm@ugr.es

Received: 9 December 2002
Accepted: 21 February 2003

Abstract

We present the analysis of baryonic and non-baryonic matter distribution in a sample of ten nearby clusters () with temperatures between 4.7 and 9.4 keV. These galaxy clusters are studied in detail using X-ray data and global physical properties are determined. Correlations between these quantities are analysed and compared with the results for distant clusters. We find an interesting correlation between the extent of the intra-cluster gas relative to the dark matter distribution. The extent of the gas relative to the extent of the dark matter tends to be larger in less massive clusters. This correlation might give us some hints on non-gravitational processes in clusters. We do not see evolution in the gas mass fraction out to a redshift of unity. Within r₅₀₀, the mean gas mass fraction obtained is .