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Abstract: We use optical photometric and polarimetric data of BL Lacertae that cover aperiod of 22 years to study the variability of the source. The long-termobservations are employed for establishing parameters of a stochastic modelconsisting of the radiation from a steady polarized source and a number ofvariable components with different polarization parameters, proposed byHagen-Thorn et al. earlier. We infer parameters of the model from theobservations using numerical simulations based on a Monte Carlo method, withvalues of each model parameter selected from a Gaussian distribution. Wedetermine the best set of model parameters by comparing model distributions tothe observational ones using the chi-square criterion. We show that theobserved photometric and polarimetric variability can be explained within amodel with a steady source of high polarization, ~40%, and with direction ofpolarization parallel to the parsec scale jet, along with 10+-5 sources ofvariable polarization.



Autor: D. A. Blinov, V. A. Hagen-Thorn

Fuente: https://arxiv.org/







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