Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99....1k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 1-6.
Astronomy and Astrophysics
Astronomy
103
Bl Lacertae Objects, Charge Coupled Devices, Extragalactic Radio Sources, Polarization Characteristics, Radio Spectra, Astronomical Catalogs, High Frequencies, Magellanic Clouds, Milky Way Galaxy, Sky Surveys (Astronomy), Statistical Distributions
Scientific paper
A uniform sample of 43 BL Lacertae objects selected from two flux-limited radio surveys is presented. From confirming optical polarimetric observations, it is clear that the combination of a flat high-frequency radio spectrum (11-6 cm) and featureless optical continuum are very effective at isolating classical BL Lacs, with 95 percent of sources satisfying these criteria also proving to be strongly polarized on at least one occasion. Variability is also a general characteristic of the sample, with a typical radio-selected BL Lac spending 60 percent of the time in a state of 'high' polarization (P greater than 3 percent). The completeness of this sample of BL Lac objects and the relationship between the radio-selected nuclei and their more docile X-ray-selected counterparts are discussed.
Kuehr Helmut
Schmidt Gary D.
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