Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..52..177g&link_type=abstract
Astrophysics and Space Science, vol. 52, no. 1, Nov. 1977, p. 177-188.
Astronomy and Astrophysics
Astronomy
6
Galactic Clusters, Galactic Radio Waves, Low Frequencies, Radio Emission, Spatial Distribution, High Energy Electrons, Radio Spectra, Relativistic Particles, Sky Surveys (Astronomy), Tables (Data)
Scientific paper
The distribution of the ten brightest galaxies in Abell and Zwicky clusters with LF radio emission is examined on glass copies of red Palomar Sky Survey plates in order to investigate whether the effects of dynamical evolution are more prominent for clusters in which steep-spectrum radio sources occur. Radio spectra and spectral indices between 38 and 178 MHz are derived for the cluster radio sources, and the distribution of the ten brightest galaxies is determined separately for each cluster with and without a dominant galaxy. The results indicate that: (1) radio sources with steep LF spectra occur more often in rich clusters; (2) powerful LF radio emission is more common among clusters with dominant cD galaxies, the radio emission from such a cluster is generally associated with the cD galaxy, and its LF spectrum may be either steep or normal; (3) radio emission from a cluster without a dominant cD galaxy usually has a steep LF spectrum if it coincides with a core of bright galaxies; and (4) all the cores are at projected distances of more than 300 kpc from the cluster centers and probably reflect mass segregation due to dynamical evolution of the clusters.
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