Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...385...55h&link_type=abstract
Astronomy and Astrophysics, v.385, p.55-61 (2002)
Astronomy and Astrophysics
Astrophysics
8
Bl Lac Objects: Individual: Bl Lac, Techniques: Polarimetric
Scientific paper
An analysis is performed of polarimetric and photometric observations of BL Lac carried out in 1969-1991 at the Astronomical Institute of St. Petersburg State University. The distribution of polarization directions certainly points to the existence of the preferred direction of polarization (theta = 22degr ) close to the direction of the jet observed by VLBI. High polarization degree and colorimetric data are evidence of the synchrotron nature of the variable source. The relative Stokes parameters are distributed normally over some mean value. The correlations between different parameters characterizing the flux density and polarization of the central point source allow us to consider that in BL Lac there is a continually acting source of polarized radiation on which the sources with randomly distributed polarization directions are superimposed. Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/385/55
Bjornsson Claes-Ingvar
Hagen-Thorn Vladimir A.
Jorstad Svetlana G.
Larionov Valeri M.
Larionova Elena G.
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