Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238l.117b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 238, June 15, 1980, p. L117-L122.
Astronomy and Astrophysics
Astrophysics
33
Galactic Clusters, Optical Properties, X Ray Sources, Extragalactic Radio Sources, Galactic Radiation, Radiant Flux Density, Spiral Galaxies
Scientific paper
The galaxy density, spiral content, and richness of the 23 poor clusters of galaxies cataloged by Morgan and co-workers are determined and compared with those of Abell clusters. It is found that Morgan's clusters generally represent a smooth continuation of the galaxy clustering spectrum from the rich Abell clusters. This continuity in optical properties implies a corresponding continuity in X-ray properties. The extended X-ray emission recently detected from several of Morgan's clusters is consistent with the amount of thermal bremsstrahlung emission expected on the basis of the present optical observations and previous correlations of X-ray-optical cluster properties. The fraction of cluster galaxies that are spirals is a sensitive function of the galaxy surface density, N(-)0.
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