Color variability of the blazar AO 0235+16 |
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| Authors: | V A Hagen-Thorn V M Larionov C M Raiteri E I Hagen-Thorn A V Shapiro A A Arkharov L O Takalo A Sillanpää |
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| Institution: | (1) Sobolev Astronomical Institute, St. Petersburg State University, Bibliotechnaya pl. 2, Petrodvorets, 198904, Russia;(2) INAF—Osservatorio Astronomico di Turino, Via Osservatorio, 20 10025 Pino Torinese (TO), Turin, Italy;(3) Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, St. Petersburg, 196140, Russia;(4) Tuorla Observatory, University of Turku, Vaisalantie 20, FI 21500 Piikkio, Turku, Finland |
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| Abstract: | Multicolor (UBVRIJHK) observation of the blazar AO 0235+16 are analyzed. The light curves were compiled at the Turin Observatory from literature
data and the results of observations obtained in the framework of the WEBT program (). The color variability of the blazar was studied in eight time intervals with a sufficient number of multicolor optical
observations; J H K data are available for only one of these. The spectral energy distribution (SED) of the variable component remained constant within each interval, but varied strongly from one interval to another. After correction for
dust absorption, the SED can be represented by a power law in all cases, providing evidence for a synchrotron nature of the
variable component. We show that the variability at both optical and IR wavelengths is associated with the same variable source. |
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