Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0729h&link_type=abstract
American Astronomical Society, HEAD meeting #9, #7.29; Bulletin of the American Astronomical Society, Vol. 38, p.354
Astronomy and Astrophysics
Astronomy
Scientific paper
We present progress on an all-sky (|b| > 10°) survey of radio blazars likely to be detected at high energies by the GLAST mission. Our parent population is a sample of 11,000 flat-spectrum radio sources, which have been imaged at 8 GHz. From this, we use the radio and X-ray properties to select a Candidate Gamma-RAy Blazar Sample (CGRaBS) of the 1500 sources most like the EGRET gamma-ray blazars. We expect that these sources will be prominent among the 3000-10000 blazars that should be detected by the LAT on GLAST, scheduled for launch in 2007. We report here on progress toward optical characterization of the sample, with spectroscopy obtained largely at the Hobby*Eberly Telescope. This blazar sample is dominated by FSRQs, with 10% BL Lacs. We show our redshift distribution to date, with sources extending up to z > 5, and describe some SEDs of blazars from the sample, which support the idea that a strong Compton peak should be detectable up to gamma-ray energies. With an expanded observing campaign ramping up in 2006/2007, we expect to reach reasonable completion before GLAST launch. This sample should be very valuable for study of the blazar population and its evolution as well as an important tool for selecting key objects for multiwavelength studies coordinated with the gamma-ray observations.
CGRaBS Team
Healey Stephen E.
Michelson Peter F.
Romani Roger W.
Schlafly Edward F.
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