Mathematics – Probability
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ycat..33430086g&link_type=abstract
VizieR On-line Data Catalog: J/A+A/343/86. Originally published in: 1999A&A...343...86G
Mathematics
Probability
Clusters: Galaxy, Galaxies: Radio, Morphology
Scientific paper
We cross-correlate the galaxies brighter than mB=18 in the 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. (1 data file).
Boselli Alessandro
Gavazzi Giuseppe
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