Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-06
Mon.Not.Roy.Astron.Soc. 357 (2005) 1267-1280
Astronomy and Astrophysics
Astrophysics
11 pages, 7 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.08729.x
The quasar sample selected by cross-correlating the FIRST and the 2dF Quasar Redshift Surveys allows us to explore, for the first time, the faint end of the radio and optical luminosity functions up to z = 2.2. We find indications (~3 \sigma) of a negative evolution for these faint sources at z > 1.8, both in radio and optical bands. This corresponds to a decrement in the space density of faint quasars of about a factor 2 at z=2.2 and confirms the presence of a differential evolution for the population of radio-active quasars. The faint end of both luminosity functions flattens and the comparison with the (optical) number density of the whole quasar population supports a dependence of the fraction of radio detected quasars on the optical luminosity. A progressive decrease in the fraction of quasars in the whole radio source population can be consistently accounted for within the `receding torus' scenario. The population of low luminosity quasars, which the FIRST-2dF detects, appears to depart from the `classical' scheme for radio-loud quasars.
Celotti Annalisa
Cirasuolo Michele
Magliocchetti Manuela
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