The DRaGONS Survey: A Search for High Redshift Radio Galaxies and Heavily Obscured AGNs

Details The DRaGONS Survey: A Search for High Redshift Radio Galaxies and Heavily Obscured AGNs The DRaGONS Survey: A Search for High Redshift Radio Galaxies and Heavily Obscured AGNs

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.5206s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #52.06; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first results from the Distant Radio Galaxies Optically Non-detected in the SDSS (DRaGONS) survey. Using a novel selection technique for identifying high redshift radio galaxy (HzRG) candidates, a large sample is compiled using bright radio sources from the Faint Images of the Radio Sky at Twenty centimeters (FIRST) survey having no optical counterpart in the Sloan Digital Sky Survey (SDSS). Near-infrared (NIR) K-band imaging with the FLAMINGOS instrument on the Mayall telescope at Kitt Peak allows preliminary identification of HzRG candidates through the well-known K-z relation. Redshifts based on a linear fit to the K-z Hubble diagram give a mean redshift for our sample of z=2.5 and a median redshift of z=2.0, showing that this method should be very efficient at identifying a large number of HzRGs. This selection is also sensitive to a previously unseen population of anomalously red radio galaxies (r-K>6.5-7), dubbed Red DRaGONS, which may indicate significant obscuration at moderate redshifts. These obscured objects can be used to test the completeness of QSO surveys to the effects of reddenning. More than ten percent of our sample falls into this category, which may represent a sizable radio loud population missing from current optically selected AGN samples.

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