Available formats: HTML | PDF | (gzipped) PostScript
On the local radio luminosity function of galaxies
I. The Virgo cluster *
G. Gavazzi 1 and
A. Boselli 2
Received 11 September 1998 / Accepted 5 November 1998
We cross-correlate the galaxies brighter than in the Virgo cluster with the radio sources in the NVSS survey (1.4 GHz), 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 () distribution is gaussian, centered at , 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 .
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 () have a probability of feeding low power radio sources similar to that of dwarf E galaxies as faint as .
Key words: galaxies: clusters: individual: Virgo cluster galaxies: fundamental parameters galaxies: luminosity function, mass function radio continuum: galaxies
Send offprint requests to: G. Gavazzi (Gavazzi@trane.uni.mi.astro.it)
Online publication: March 1, 1999