Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198....1i&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Jan. 1982, p. 1-9.
Astronomy and Astrophysics
Astronomy
42
Astronomical Photometry, Bl Lacertae Objects, Infrared Astronomy, Optical Polarization, Polarimetry, Radio Bursts, Linear Polarization, Nonthermal Radiation, Stellar Luminosity, Synchrotron Radiation, Thermal Radiation, Variable Stars
Scientific paper
A polarization burst during which the 2.2-micron polarization of the object AO 0235+164 rose from 17.5 to 28.7%, and fell again to 14.9%, has been observed by simultaneous IR and optical polarimetry and photometry covering a five-night period. The peak optical polarization of 43.9% is the highest linear polarization observed in a BL Lac object. The degree of polarization is found to increase toward shorter wavelengths, an effect that is inconsistent with the dilution by a galactic component and simple, one-component synchrotron models. Conventional models are also found to be inadequate in explaining the fact that large changes in polarization are not accompanied by large changes in flux. Attention is given to the thermal and non-thermal radiation characteristics of the object, and to its power source, which may be a supermassive rotating magnetoid fueled by accretion.
Brand Peter W. J. L.
Impey Chris David
Tapia Saul
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