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Astron. Astrophys. 343, 86-92 (1999)

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On the local radio luminosity function of galaxies

I. The Virgo cluster *

G. Gavazzi 1 and A. Boselli 2

1 Universitá degli Studi di Milano, Via Celoria 16, I-20133 Milano, Italy
2 Laboratoire d'Astronomie Spatiale, Traverse du Siphon, B.P. 8, F-13376 Marseille Cedex 12, France

Received 11 September 1998 / Accepted 5 November 1998


We cross-correlate the galaxies brighter than [FORMULA] 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 ([FORMULA]) distribution is gaussian, centered at [FORMULA], i.e. the radio luminosity is [FORMULA] 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 [FORMULA] 5 less frequent than later types at any [FORMULA].

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 ([FORMULA]) have a probability of feeding low power radio sources similar to that of dwarf E galaxies as faint as [FORMULA].

Key words: galaxies: clusters: individual: Virgo cluster – galaxies: fundamental parameters – galaxies: luminosity function, mass function – radio continuum: galaxies

* Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: G. Gavazzi (Gavazzi@trane.uni.mi.astro.it)

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© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999