Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....25..485h&link_type=abstract
(Astrofizika, vol. 25, Nov.-Dec. 1986, p. 485-494) Astrophysics (ISSN 0571-7132), vol. 25, no. 3, May 1987, p. 634-640. Translat
Astronomy and Astrophysics
Astrophysics
2
Astronomical Photometry, Bl Lacertae Objects, Polarimetry, Brightness Distribution, Magnetic Fields, Synchrotron Radiation
Scientific paper
The analysis of the results of polarimetric and photometric observations (1969 - 1982) of BL Lac published in 1984 is continued. It has been found that, on an average, little correlation exists between the degree of polarization and brightness, but the polarization angles show a dependence on brightness. This is in agreement with the idea of a continuously acting polarized source in the Lacertids; its polarization angle defines the preferable direction. At separate time intervals the behaviour of BL Lac is found to be determined by individual variable sources with very high polarization (≈50%). Synchrotron nature of these sources is beyond doubt. The existence of a preferable direction of polarization is then an indication of a stable magnetic field in BL Lac.
Hagen-Torn V. A.
Iakovleva V. A.
Marchenko Svetlana G.
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