Optical and X-ray Properties of Groups of Galaxies

Details Optical and X-ray Properties of Groups of Galaxies Optical and X-ray Properties of Groups of Galaxies

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1506d&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #15.06; Bulletin of the American Astronomical Society, Vol. 24, p.1144

Astronomy and Astrophysics

Astronomy

Scientific paper

We study the optical and x-ray properties of 30 groups of galaxies observed with EINSTEIN. We have obtained redshifts for the galaxies in the group fields down to a limiting magnitude M_B<= 15.7. Typically this corresponds to ~ 18 redshifts per group. Our sample contains 14 MKW-AWM clusters, three of which are actually superpositions of two groups. We compare the velocity dispersions and virial masses we derive from the optical data with the x-ray luminosity and structure. We find remarkable correlations between the x-ray structure and optical galaxy positions. The x-ray emission associated with the galaxies is extended even in more distant groups. This emission is probably due to hot gas in the individual galaxy potentials, which implies that the poor clusters of galaxies are dynamically young. This is consistent with results from N-body simulations of group formation.

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