A statistical study of radio emission in E and S0 galaxies
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Abstract
Data for 574 E and 50 galaxies in the Arecibo 2380 MHz survey of bright galaxies has been analyzed statistically to find relationships between galactic properties and the occurrence and characteristics of radio sources. Extended sources occur more frequently and on a larger scale in E galaxies than in 50 galaxies. Predominantly compact sources occur at similar rates in E and 50 galaxies. The more luminous an E or 50 galaxy is, the more likely it is to be a radio source. An elliptical galaxy (but not an SO galaxy) is much more likely to be a radio source if it is in a Zwicky cluster, and is still more likely to be a source if it is in a group within the cluster. The relatively high detection rate of E galaxies in groups and clusters could be explained by (1) the possibility that elliptical galaxies in groups and clusters have a higher proportion of very luminous galaxies than field elliptical galaxies do, and/or (2) the possibility that interactions between elliptical galaxies and their companions, and between extended radio sources and intergalactic gas, contribute to the production and maintenance of radio sources.
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