Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730406k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #304.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
In spite of nearly 50 years of study, it is still unclear whether or not the radio emission from QSOs is bimodal consisting of distinct radio loud and radio quiet populations. New 5 GHz EVLA observations exploit two recent developments: a) the availability of the recent DR7 SDSS to provide a volume limited sample of 197 confirmed QSOs (M<-23) within the narrow range 0.2 < z < 0.3; and b) the dramatic improvement in radio continuum sensitivity made possible by the increased bandwidth of the EVLA which lets us detect, with only 10 minutes of integration, a source as faint as L = 10^22 W/Hz, well below the value which separates star-forming galaxies from AGN. We report on early results from the EVLA on a sub set of our QSO sample. Previous studies have been limited by the inhomogeneity of the optical QSO sample, inadequate sensitivity to fully sample the radio quiet population, the degeneracy between redshift and luminosity for flux density limited samples, as well as by strong evolution over the wide range of observed redshifts.
Condon James J.
Ivezic Zeljko
Kellermann Kenneth I.
Kimball Amy E.
Perley Rick
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