Are all flat-spectrum radio sources blazars?

Details Are all flat-spectrum radio sources blazars? Are all flat-spectrum radio sources blazars?

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205...86f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 86-92.

Astronomy and Astrophysics

Astronomy

34

Active Galactic Nuclei, Bl Lacertae Objects, Blazars, Extragalactic Radio Sources, Optical Polarization, Quasars, Astronomical Catalogs, Astronomical Photometry, Radio Astronomy

Scientific paper

The author presents a statistical analysis of optical polarization data of extragalactic radio sources selected from 5 GHz samples. The probability of observing high polarization (P > 3%) in a highly polarized quasar (HPQ) in a single measurement is found to be about 0.62. Allowing for the detection probability, the author estimates that about 2/3, probably even more, of all flat-spectrum radio sources are blazars (HPQs or BL Lac objects). Discordant blazar detection rates reported in previous polarimetric studies are due to different fractions of steep- and flat-spectrum quasars and to the inclusion or exclusion of BL Lacs.

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