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

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

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..541s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 2, p. 541-549.

Astronomy and Astrophysics

Astronomy

75

Active Galactic Nuclei, Bl Lacertae Objects, Radio Astronomy, Visible Spectrum, X Ray Astronomy, Astronomical Spectroscopy, Very Large Array (Vla)

Scientific paper

We report the recent discovery of ten BL Lac objects in the Einstein IPC Slew Survey by means of X-ray/radio versus X-ray/optical color-color diagrams and confirming optical spectroscopy. These ten BL Lac objects were discovered using a technique proposed by Stocke et al. (1989) which exploits the characteristic broad-band spectra of BL Lac objects. New VLA detections provide accurate fluxes (limiting f(6 cm) about 0.5 mJy) and about 1 arcsec positions, facilitating the determination of an optical counterpart. All ten new BL Lac objects show essentially featureless optical spectra and lie within the range of radio/X-ray/optical colors of known X-ray-selected BL Lac objects, when about 1 mag optical variability is included. We expect about 50 new BL Lac objects in total, from complete optical follow-up of our now completed VLA work and recent Australia Telescope observations, yielding a complete Slew Survey sample of about 90 BL Lac objects.

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