Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l..77b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 15, 1977, p. L77-L82.
Astronomy and Astrophysics
Astronomy
95
Bremsstrahlung, Galactic Clusters, Red Shift, X Ray Sources, Ariel 5 Satellite, Intergalactic Media, Morphology, Southern Hemisphere, Spaceborne Astronomy
Scientific paper
The entire sample of 37 X-ray clusters of galaxies detected by the Ariel 5 satellite at high latitudes is analyzed optically. Morphological types (for all clusters) and central galaxy densities (for all clusters with measured redshifts) are determined, and the positions, redshifts, and richness groups of the set of Southern Hemisphere X-ray clusters are estimated. The X-ray luminosity is found to be correlated with both cluster morphology and central galaxy density. The observed correlations are consistent with a thermal-bremsstrahlung model in which the hot intracluster gas density is proportional to the galaxy density, and the temperature is proportional to the galaxy velocity dispersion.
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