Thirteen new BL Lacertae objects discovered by an efficient X ray/radio/optical technique

Details Thirteen new BL Lacertae objects discovered by an efficient X ray/radio/optical technique Thirteen new BL Lacertae objects discovered by an efficient X ray/radio/optical technique

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992slew.reptr....s&link_type=abstract

In Smithsonian Astrophysical Observatory, The Einstein All-Sky Slew Survey 18 p (SEE N93-20793 07-89)

Astronomy and Astrophysics

Astronomy

Bl Lacertae Objects, Color-Color Diagram, Radio Astronomy, Sky Surveys (Astronomy), Spectroscopy, Broadband, Cosmic X Rays, Stellar Magnitude, X Ray Sources

Scientific paper

The discovery of 13 serendipitous BL Lac objects in the Einstein IPC Slew Survey by means of x ray/radio vs. x ray/optical color-color diagrams and confirmation by optical spectroscopy are reported. These 13 BL Lacs were discovered using a technique which exploits the characteristic broad band spectra of BL Lacs. New VLA detections provide accurate fluxes (f(6 cm) is approximately 0.5 mJy) and 2 in. positions, facilitating the determination of an optical counterpart. All 13 new BL Lacs show essentially featureless optical spectra. Nine of these lie within the range of colors of known x ray selected BL Lacs. Of the remaining four, one is apparently x ray louder (by a factor of 1.5) or optically quieter (by 0.8 mags); and three are optically louder (by 1-1.3 mags) than x ray selected BL Lacs. Approximately 50 new BL Lacs in total are expected from VLA work and upcoming Australia Telescope observations, yielding a complete Slew Survey sample of approximately 90 BL Lacs.

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