Mathematics – Logic
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3508p&link_type=abstract
American Astronomical Society, HEAD meeting #12, #35.08
Mathematics
Logic
Scientific paper
We use non-parametric methods developed by Efron and Petrosian for simultaneous determination of the radio and optical luminosity functions, the correlations and cosmological evolutions of quasars,using a flux limited data set containing 636 quasars with radio and optical fluxes. From these we determine the distribution and evolution of of the radio loudness parameter R (the ratio of radio to optical luminosity). These methods are designed to obtain unbiased correlations, distributions, and evolution with redshift from a data set truncated due to observational biases. We find that there is a strong luminosity evolution with redshift in both wavebands, with significantly higher radio than optical evolution. We also find a strong density evolution. We compare the distribution of the radio loudness obtained from careful treatment of the selection effects and luminosity evolutions with that obtained from the raw data without such considerations, and find a significant difference between the two distributions and find no clear sign of bi-modality in the true distribution.
Petrosian Vahe
Singal Jack
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