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1999A&A...343...86G - Astronomy and Astrophysics, volume 343, 86-92 (1999/3-1)

On the local radio luminosity function of galaxies. I. The Virgo cluster.

GAVAZZI G. and BOSELLI A.

Abstract (from CDS):

We cross-correlate the galaxies brighter than mB=18 in the Virgo cluster with the radio sources in the NVSS survey (1.4GHz), resulting in 180 radio-optical identifications. We determine the radio luminosity function of the Virgo galaxies, separately for the early- and late-types. Late-type galaxies develop radio sources with a probability proportional to their optical luminosity. In fact their radio/optical (RB) distribution is gaussian, centered at log RB~-0.5, i.e. the radio luminosity is ∼0.3 of the optical one. The probability of late-type galaxies to develop radio sources is almost independent of their detailed Hubble type, except for Sa (and S0+S0a) which are a factor of ∼5 less frequent than later types at any RB. Giant elliptical galaxies feed "monster" radio sources with a probability strongly increasing with mass. However the frequency of fainter radio sources is progressively less sensitive on the system mass. The faintest giant E galaxies (MB=-17) have a probability of feeding low power radio sources similar to that of dwarf E galaxies as faint as MB=-13.