Open AccessLinking radio to infrared: a radio source count model
Author(s) -
King A. J.,
RowanRobinson M.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07605.x
Subject(s) - physics , quasar , astrophysics , radio galaxy , luminosity , infrared , source counts , x shaped radio galaxy , astronomy , radio frequency , radio spectrum , galaxy , redshift , telecommunications , computer science
We investigate the populations and evolution of normal and active galaxies by extending the recent infrared source count model of Rowan‐Robinson into the radio. The far‐infrared–radio correlation is used to extend the spectral energy distributions to the radio region, and it is assumed that there are two distinct populations of quasar: radio‐loud and radio‐quiet. It is found that the radio luminosity function and source count data are best fitted when the fraction of quasars that are radio‐loud is allowed to increase with optical luminosity. The implications for this are discussed, as are the possible causes for the variation in radio‐loud fraction.