Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...76..145f&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 76, no. 1, Nov. 1988, p. 145-156.
Astronomy and Astrophysics
Astronomy
45
Astronomical Photometry, Charge Coupled Devices, Polarimetry, Quasars, Radio Sources (Astronomy), Blazars, Polarized Radiation, Radio Spectra, Star Distribution, Thermal Radiation
Scientific paper
The authors present CCD polarimetry of the optical counterparts of 48 radio sources selected from 5 GHz surveys. 37 sources were observed polarimetrically for the first time, 22 of which were fainter than R = 19m. One object, the blazar PKS 0219-164, was monitored continuously for almost a month. Based on polarization, they discovered 9 new blazars and a further 6 new probable blazars. Among the 38 sources with distinct polarimetric properties, the blazar detection rate is almost 50%. Much lower blazar detection rates reported in previous surveys of radio-loud quasars are mainly due to the contribution of quasars with steep radio spectra. Photometric and polarimetric observations of optically quiet compact radio sources (OQCRSs) indicate that many of these objects are blazars. Frequently, the authors found evidence of a galaxy contributing to the optical spectrum of an OQCRS. 0500+01 is the quasar with the steepest optical spectrum ever observed.
Fugmann W.
Meisenheimer Klaus
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