Signals From The Noise: Image Stacking For Quasars In The First Survey

Details Signals From The Noise: Image Stacking For Quasars In The First Survey Signals From The Noise: Image Stacking For Quasars In The First Survey

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.5210h&link_type=abstract

American Astronomical Society Meeting 208, #52.10; Bulletin of the American Astronomical Society, Vol. 38, p.132

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a technique to explore the radio sky into the nanoJansky regime by employing image stacking using the FIRST radio sky survey. A detailed examination of the systematic effects in VLA snapshot images has resulted in a calibration that allows us to recover the average properties of any source population with astrometric positions good to 1". We demonstrate the utility of this technique by exploring the radio properties of the SDSS quasars. We compute the mean luminosities and radio loudness parameters for the 46,420 quasars in the SDSS DR3 catalog; the latter quantity remains in excess of R>-0.6 at all redshifts raising the question as to whether or not radio-silent quasars exist. We go on to examine the radio properties of BAL quasars, finding,surprisingly, that these objects have a higher mean radio flux density at all redshifts, with the greatest disparity arising in the rare loBAL objects. This result is apparently incompatible with the orientation hypothesis advanced to explain the BAL phenomenon.

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