Two BL Lacertae objects discovered through their optical variability

Details Two BL Lacertae objects discovered through their optical variability Two BL Lacertae objects discovered through their optical variability

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..421h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 421-425.

Astronomy and Astrophysics

Astronomy

14

Bl Lacertae Objects, Light Curve, Quasars, Variability, Astronomical Polarimetry, Astronomical Spectroscopy, Schmidt Telescopes, Sky Surveys (Astronomy)

Scientific paper

A survey for variable quasars over an 18-deg-squared field was started in 1977 with the UK 1.2-m Schmidt telescope. In the course of the survey, 23 objects with a variability amplitude of not less than 1 mag were found. Spectroscopic observations of 14 of them have shown that two have featureless spectra; both have a high degree of optical polarization (5.9 and 9.6 percent respectively), and both are radio sources with a flat spectrum between 843 and 4790 MHz. There is no doubt that they are BL Lac objects. The minimum corresponding surface density of about 0.1/deg at B of about 19 is equal to the upper limit derived by Woltjer and Setti (1982).

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