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Analysis of Color Variability of BL Lac during the 1997 and 1999 Outbursts

Published online by Cambridge University Press:  12 April 2016

V.A. Hagen-Thorn ,
V.M. Larionov ,
A.V. Hagen-Thorn ,
S.G. Jorstad  and
G.O. Temnov
V.A. Hagen-Thorn
Affiliation:
Astronomical Institute, St. Petersburg University, St. Petersburg, Petrodvorets Bibliotechnaya pl. 198504, Russia
V.M. Larionov
Affiliation:
Astronomical Institute, St. Petersburg University, St. Petersburg, Petrodvorets Bibliotechnaya pl. 198504, Russia
A.V. Hagen-Thorn
Affiliation:
Astronomical Institute, St. Petersburg University, St. Petersburg, Petrodvorets Bibliotechnaya pl. 198504, Russia
S.G. Jorstad
Affiliation:
Astronomical Institute, St. Petersburg University, St. Petersburg, Petrodvorets Bibliotechnaya pl. 198504, Russia
G.O. Temnov
Affiliation:
Astronomical Institute, St. Petersburg University, St. Petersburg, Petrodvorets Bibliotechnaya pl. 198504, Russia

Abstract

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The analysis of multicolor observations of BL Lac obtained in the 1997 and 1999 outbursts shows that in both cases the spectral energy distribution of the variable source was unchanged in the course of outburst. The sources have power-law spectra with slightly different spectral indices (the spectrum was flatter in the more powerful outburst of 1997). The variable source is most probably of synchrotron nature.

Type
Part 5. AGN Phenomena
Information
International Astronomical Union Colloquium , Volume 184: AGN Surveys , 2002 , pp. 363 - 364
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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