EDP Sciences
Free access
Volume 403, Number 2, May IV 2003
Page(s) 433 - 442
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20030298

A&A 403, 433-442 (2003)
DOI: 10.1051/0004-6361:20030298

Distribution of dark and baryonic matter in clusters of galaxies

A. Castillo-Morales1, 2 and S. Schindler3, 2

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

(Received 9 December 2002 / Accepted 21 February 2003)

We present the analysis of baryonic and non-baryonic matter distribution in a sample of ten nearby clusters ( 0.03<z<0.09) 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 $(0.16\pm0.02)h_{50}^{-3/2}$.

Key words: galaxies: clusters: general -- intergalactic medium -- cosmology: observations -- cosmology: theory -- dark matter -- X-rays: galaxies: clusters

Offprint request: A. Castillo-Morales, acm@ugr.es

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