UBVRI photopolarimetry of BL Lac objects - The connection between frequency-dependent polarization and growing radio shocks

Details UBVRI photopolarimetry of BL Lac objects - The connection between frequency-dependent polarization and growing radio shocks UBVRI photopolarimetry of BL Lac objects - The connection between frequency-dependent polarization and growing radio shocks

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101...78v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 78-87. Research supported by the Finnish Academy of Sciences and

Astronomy and Astrophysics

Astronomy

33

Astronomical Photometry, Bl Lacertae Objects, Polarimetry, Ubv Spectra, Active Galactic Nuclei, Blazars, Markarian Galaxies, Polarized Radiation

Scientific paper

Results are reported from 61 truly simultaneous polarimetric and photometric observations in UBVRI bands of 10 BL Lac objects. The aim of the observations has been to search for frequency-dependent polarization properties in these sources and to investigate the characteristics of their variations. First, detection of frequency dependent polarization in OF 038 (0422 + 004) and 3C 371, and the first detection of frequency dependent position angle in Mkn 421 are reported. Also it is found that the strength of the frequency dependence in polarization, P(U)/P(I), increases with increasing P(U) but decreases with increasing P(I). Comparison of optical data with radio outbursts indicates that the observed variations in the wavelength dependence of the optical polarization could be caused by growing shocks responsible for the radio outbursts.

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