A VLA 20 and 90 centimetre radio survey of distant Abell clusters with central cD galaxies

Details A VLA 20 and 90 centimetre radio survey of distant Abell clusters with central cD galaxies A VLA 20 and 90 centimetre radio survey of distant Abell clusters with central cD galaxies

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994japa...15..275b&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 15, no. 3, p. 275-308

Astronomy and Astrophysics

Astrophysics

6

Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Radio Astronomy, Radio Sources (Astronomy), Radio Spectra, Sky Surveys (Astronomy), Brightness, Cooling Flows (Astrophysics), Luminosity, Radiant Flux Density, Radio Observation, Spectrum Analysis, Very Large Array (Vla)

Scientific paper

A radio survey, using the Very Large Array (VLA) at 20 and 90 cm lambda has been carried out in the direction of 46 distant Abell clusters (0.1 less than or = z less than or = 0.3) dominated by a cD galaxy (clusters classified to be Bautz-Morgan I type). A radio source coincident with the cD galaxy was detected in 16 clusters. We find that the radio luminosity function of the cD galaxies at 20 cm lambda, and below the luminosity P1.4GHz less than or = 1024.5 W/Hz, is similar to that of brightest ellipticals in less clustered environments. Above this luminosity, the cDs seem to have a higher probability of becoming radio sources. The effect of optical brightness on radio emission is shown to be the same for the two classes. No significantly large population of very-steep-spectrum sources with spectral index alpha greater than 1.2 (flux density proportional to frequency-alpha) was found to be associated with cD galaxies. A significant negative correlation is found between the radio luminosity of the cD galaxy and the cooling-time of the intra cluster medium near the galaxy. We also present evidence that the probability of radio emission from first-ranked galaxies is dependent upon their location relative to the geometrical centers of clusters and thus related to the morphological class and the evolutionary state of the clusters. We argue that both these effects are primarily caused by the dynamical evolution of these distant clusters of galaxies.

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