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Title:
The Deep X-Ray Radio Blazar Survey (DXRBS) - II. New identifications
Authors:
Landt, Hermine; Padovani, Paolo; Perlman, Eric S.; Giommi, Paolo; Bignall, Hayley; Tzioumis, Anastasios
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA; Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany), AB(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA), AC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA), AD(BeppoSAX Science Data Center, ASI, Via Corcolle 19, I-00131 Roma, Italy), AE(Department of Physics and Mathematical Physics, University of Adelaide, SA 5005, Australia), AF(Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 323, Issue 3, pp. 757-784. (MNRAS Homepage)
Publication Date:
05/2001
Origin:
MNRAS
MNRAS Keywords:
SURVEYS, BL LACERTAE OBJECTS: GENERAL, QUASARS: GENERAL, RADIO CONTINUUM: GALAXIES, X-RAYS: GALAXIES
DOI:
10.1046/j.1365-8711.2001.04269.x
Bibliographic Code:
2001MNRAS.323..757L

Abstract

We have searched the archived, pointed ROSAT Position Sensitive Proportional Counter data for blazars by correlating the WGACAT X-ray data base with several publicly available radio catalogues, restricting our candidate list to serendipitous X-ray sources with a flat radio spectrum (αr<=0.70, where Sν~ν-α). This makes up the Deep X-ray Radio Blazar Survey (DXRBS). Here we present new identifications and spectra for 106 sources, including 86 radio-loud quasars, 11 BL Lacertae objects, and nine narrow-line radio galaxies. Together with our previously published objects and already-known sources, our sample now contains 298 identified objects: 234 radio-loud quasars [181 flat-spectrum quasars: FSRQ (αr<=0.50) and 53 steep-spectrum quasars: SSRQ], 36 BL Lacs and 28 narrow-line radio galaxies. Redshift information is available for 96 per cent of these. Thus our selection technique is ~90 per cent efficient at finding radio-loud quasars and BL Lacs. Reaching 5-GHz radio fluxes ~50mJy and 0.1-2.0keV X-ray fluxes a few ×10-14ergcm-2s-1, DXRBS is the faintest and largest flat-spectrum radio sample with nearly complete (~85 per cent) identification. We review the properties of the DXRBS blazar sample, including redshift distribution and coverage of the X-ray-radio-power plane for quasars and BL Lacs. Additionally, we touch upon the expanded multiwavelength view of blazars provided by DXRBS. By sampling for the first time the faint end of the radio and X-ray luminosity functions, this sample will allow us to investigate the blazar phenomenon and the validity of unified schemes down to relatively low powers.

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