Hot gas and dark matter in a compact galaxy group

Details Hot gas and dark matter in a compact galaxy group Hot gas and dark matter in a compact galaxy group

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.363...51p&link_type=abstract

Nature (ISSN 0028-0836), vol. 363, no. 6424, p. 51-54.

Computer Science

136

Dark Matter, Galactic Clusters, High Temperature Gases, Interacting Galaxies, Elliptical Galaxies, Galactic Evolution, Molecular Clouds, Rosat Mission, X Ray Sources, X Ray Spectra

Scientific paper

The Rosat X-ray telescope was used to detect and study a large cloud of hot gas centered on the compact group of galaxies HCG62. Radial profiles of the X-ray flux and emission spectra were studied. The properties of the gas cloud provide information about the distribution of dark matter and the evolution of the group. Results indicate that the compact core of galaxies formed as a result of orbital decay in a more extended system and may culminate in a final merger. It is suggested that a new class of fossil groups, consisting of a large elliptical galaxy embedded at the center of an extended X-ray halo, may be discovered by Rosat.

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