Stochastic model of optical variability of BL Lacertae

Details Stochastic model of optical variability of BL Lacertae Stochastic model of optical variability of BL Lacertae

2009-06-28

arxiv.org/abs/0906.5127v2

A&A 503, 103-106 (2009)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 10 figures, published by Astronomy and Astrophysics; v2: typos corrected

Scientific paper

10.1051/0004-6361/200912677

We use optical photometric and polarimetric data of BL Lacertae that cover a period of 22 years to study the variability of the source. The long-term observations are employed for establishing parameters of a stochastic model consisting of the radiation from a steady polarized source and a number of variable components with different polarization parameters, proposed by Hagen-Thorn et al. earlier. We infer parameters of the model from the observations using numerical simulations based on a Monte Carlo method, with values of each model parameter selected from a Gaussian distribution. We determine the best set of model parameters by comparing model distributions to the observational ones using the chi-square criterion. We show that the observed photometric and polarimetric variability can be explained within a model with a steady source of high polarization, ~40%, and with direction of polarization parallel to the parsec scale jet, along with 10+-5 sources of variable polarization.

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