3C 66A: Synchrotron Radiation Strength Variation in 2003

Details 3C 66A: Synchrotron Radiation Strength Variation in 2003 3C 66A: Synchrotron Radiation Strength Variation in 2003

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360..181e&link_type=abstract

AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004

Astronomy and Astrophysics

Astrophysics

Scientific paper

The BL Lac-type object 3C 66A was observed at the Crimean Astrophysical Observatory from February to December 2003 in the framework of the international program OJ-94. Photopolarimetric observations were carried out with a 125 cm telescope in the ubvri bands. In all observations the spectral energy distribution is well represented by a power-law spectrum F_{ν} with a spectral index α (F_ν˜ν^{-α}). The spectral energy distribution became flatter (α decreased from 1.47 to˜ 1.1) and the degree of polarization fell (from 15% to ˜ 2%) between February and December, when the brightness of the object increased by ˜ 1 magnitude. These effects may be due to decreasing magnetic field strength in the jet of 3C 66A.

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