Optical Identification of Flat-Spectrum Radio Sources in the Sloan Digital Sky Survey

Details Optical Identification of Flat-Spectrum Radio Sources in the Sloan Digital Sky Survey Optical Identification of Flat-Spectrum Radio Sources in the Sloan Digital Sky Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4608c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #46.08; Bulletin of the American Astronomical Society, Vol. 39, p.802

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Scientific paper

We have searched the Data Release 6 catalogues of the Sloan Digital Sky Survey for optical counterparts to flat-spectrum (alpha > -0.5 between 4.8 and 8 GHz), radio sources in the 4.8 GHz selected CRATES catalogue (Healey et al. 2007, ApJS 171, 161). Of the 3550 radio sources falling within
the DR6 footprint, about 85% are detected in the SDSS imaging to a limiting AB magnitude of gri 22.5, and about a third of these have SDSS spectra. The large majority of the optical counterparts are quasars with redshifts ranging to greater than 5, and BL Lac objects. Repeat observations of quasars in the SDSS southern stripe show variability on months to years time scales. Other flat spectrum radio sources are identified with galactic nuclei, in many cases
showing "AGN'' optical emission spectra, and with heavily reddened quasars and galaxies. Some bright elliptical galaxies have flat-spectrum radio nuclei with no other observational indicators of nuclear activity. Among the small number of "oddball'' objects are possible flaring radio stars, several known gravitationally
lensed quasars, and a probable supernova in a bright HII region in the nearby galaxy NGC 5705.
Based on data from the Sloan Digital Sky Survey (www.sdss.org).

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