Abstract
We determine the radio and optical luminosity evolutions and the true
distribution of the radio-loudness parameter R, defined as the ratio of
the radio to optical luminosity, for a set of more than 5000 quasars
combining Sloan Digital Sky Survey optical and Faint Images of the Radio
Sky at Twenty cm (FIRST) radio data. We apply the method of Efron and
Petrosian to access the intrinsic distribution parameters, taking into
account the truncations and correlations inherent in the data. We find
that the population exhibits strong positive evolution with redshift in
both wavebands, with somewhat greater radio evolution than optical. With
the luminosity evolutions accounted for, we determine the density
evolutions and local radio and optical luminosity functions. The
intrinsic distribution of the radio-loudness parameter R is found to be
quite different from the observed one and is smooth with no evidence of
a bimodality in radio loudness for log R >= –1. The results we
find are in general agreement with the previous analysis of Singal et
al., which used POSS-I optical and FIRST radio data.
Original language | English |
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Article number | 43 |
Journal | Astrophysical Journal |
Volume | 764 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Feb 2013 |
Keywords / Materials (for Non-textual outputs)
- quasars: general
- galaxies: jets
- methods: data analysis
- galaxies: active
- methods: statistical