The calibration of a radio-independent search for BL Lac objects

Details The calibration of a radio-independent search for BL Lac objects The calibration of a radio-independent search for BL Lac objects

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..849i&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 201, Dec. 1982, p. 849-866.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Bl Lacertae Objects, Calibrating, Linear Polarization, Radio Astronomy, Electrophotometers, Error Analysis, Galaxies, Linear Filters, Schmidt Telescopes, Stellar Spectra

Scientific paper

IIIa-J plates taken with a 1.2-m Schmidt telescope were measured with the Cosmos machine in a radio-independent search for BL Lac objects, using a linear polarizing filter. About 33,000 objects, covering a 10 sq deg area, were searched down to a B-value level of about 19.5. Cosmos image parameters were used to define an algorithm separating stars and galaxies and excluding merged and unmatched images. Objects were selected from the plate material according to variability and a polarization detection limit of about 15%. In terms of the known polarization properties of BL Lac objects, the search is estimated to be approximately 15% complete, and surface density limits of 0.9 +0.3 -0.9/sq deg, down to a B value of 19.0, have been inferred.

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