Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..133..353h&link_type=abstract
Astronomy and Astrophysics Supplement, v.133, p.353-359
Astronomy and Astrophysics
Astrophysics
12
Bl Lac Objects, Oj 287, Infrared: Galaxies
Scientific paper
An analysis is performed of multicolour observations of OJ 287 carried out during the OJ-94 Project. It is found that in the optical region the variable sources have the same power-law spectrum (F_nu ~ nu (-1.5) ) irrespective of flux level. In the IR the spectrum flattens during the flare possibly because of synchrotron self-absorption. The comparison of the outburst of 1994 with those of 1971 and 1983 shows that there is a clear correlation between the power of outburst and colour indices of the variable component in each event: the larger is the outburst, the bluer is the variable source, i.e. in more powerful outbursts the energy spectrum of relativistic electrons is flatter.
Boltwood Paul
Gonzalez-Perez Nicolas J.
Hagen-Thorn Vladimir A.
Kidger Marc
Marchenko Svetlana G.
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