The Fraction of Radio-loud Quasars at Faint Magnitudes and High Redshift

Details The Fraction of Radio-loud Quasars at Faint Magnitudes and High Redshift The Fraction of Radio-loud Quasars at Faint Magnitudes and High Redshift

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543314k&link_type=abstract

American Astronomical Society, AAS Meeting #215, #433.14; Bulletin of the American Astronomical Society, Vol. 42, p.372

Astronomy and Astrophysics

Astronomy

Scientific paper

Using deep observations of optically-selected quasars from the Sloan Digital Sky Survey (SDSS), we extend current analyses of the radio dichotomy to quasars at higher redshifts and with fainter optical and radio fluxes. Existing investigations have determined the radio loud fraction with respect to redshift and luminosity, but lack the deeper observations needed for a fuller understanding of quasar evolution. Utilizing 90 deg2 of deep VLA data (3x the FIRST depth, using both A and B array observations) in the SDSS Stripe 82 area (a 250 deg2 region along the celestial equator that extends 2 mag fainter than the main SDSS survey), we have deep enough data to sufficiently describe the radio loud fraction over a much larger range of redshift and luminosity. With our increased sensitivity, we will be able to probe radio-loud quasars down to i=20.4 and z= 5, and lower redshift quasars to i 23. A more complete radio loud fraction will provide a better understanding of quasar evolution, galactic evolution, and the role that radio emission plays in connecting these processes.

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