The Deep X-ray Radio Blazar Survey (DXRBS)

Details The Deep X-ray Radio Blazar Survey (DXRBS) The Deep X-ray Radio Blazar Survey (DXRBS)

1998-03-25

arxiv.org/abs/astro-ph/9803298v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. Invited talk at the ESO/ATNF Workshop "Looking Deep in the Southern Sky", Sydney, Australia, December 1997

Scientific paper

We have undertaken a survey for blazars by correlating the ROSAT WGACAT database with publicly available radio catalogs, restricting our candidate list to serendipitous flat-spectrum sources (alpha_r <= 0.7). We discuss here our survey methods, identification procedure and first results. Our survey is found to be ~ 95% efficient at finding blazars, a figure which is comparable to or greater than that achieved by other radio and X-ray survey techniques. DXRBS provides a much more uniform coverage of the parameter space occupied by blazars than any previous survey. Particularly important is the identification of a large population of flat-spectrum radio quasars with ratios of X-ray to radio luminosity >~ 10^-6 (alpha_rx <~ 0.78) and of many low-luminosity flat-spectrum radio quasars. Moreover, DXRBS fills in the region of parameter space between X-ray selected and radio-selected samples of BL Lacs.

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