Photopolarimetry of 3C 66A in 2003

Details Photopolarimetry of 3C 66A in 2003 Photopolarimetry of 3C 66A in 2003

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ap.....49...36e&link_type=abstract

Astrophysics, Volume 49, Issue 1, pp.36-53

Astronomy and Astrophysics

Astrophysics

2

Blazars, Polarimetry, Photometry-Individual, 3C 66A

Scientific paper

The BL Lac-type object 3C 66A was observed at the Crimean Astrophysical Observatory during the international project OJ-94. Observations were made over 10 nights from February through December 2003 at the Cassegrain focus of the 125-cm AZT-11 telescope with a photopolarimeter capable of simultaneous measurements in the UBVRI bands. In the course of our measurements the brightness of the object increased by more than 1 magnitude in all these bands. Its color indices varied and the degree of polarization decreased from ˜16% in February to ˜3% at the end of our observations. In December 2003 a rapid change in the position angle from 15° to 40° was noticed. The spectral energy distribution Fn is well described by a power law with a spectral index a (Fν ∝ ν -α . The increase in brightness was accompanied by a reduction in the spectral index. The most probable mechanism for the observed changes in the brightness, degree of polarization, and spectral index may be a decrease in the magnetic field strength or a change in its configuration owing to a increase in the chaotic component of the field.

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