1998/03/25 by Paolo Padovani, Padovani, Paolo, Eric Perlman +11
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9803298
6 pages, 2 figures. Invited talk at the ESO/ATNF Workshop "Looking Deep in the Southern Sky", Sydney, Australia, December 1997, to appear in the proceedings
arxiv created 1998/03/25 · arxiv updated 2009/12/01
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 (alphar <= 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 (alpharx <~ 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.