Variation of the Jet Angle of OJ287 in the Binary Black Hole Model

Details Variation of the Jet Angle of OJ287 in the Binary Black Hole Model Variation of the Jet Angle of OJ287 in the Binary Black Hole Model

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630407v&link_type=abstract

American Astronomical Society, AAS Meeting #216, #304.07; Bulletin of the American Astronomical Society, Vol. 41, p.852

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Scientific paper

A binary model of OJ287 predicted five optical outbursts for the period 1996 - 2010. These have now been observed. The rms deviation between the model and the prediction is 1.4 mJy, well below the variability range of about 14 mJy. Since the source is resolved only in radio, the changes of the jet direction in the sky are an important further test of the binary model.
We first calculate the variation of the rotation axis of the inner disk in OJ287 as a function of time. We then determine the viewing angle of the jet from the long term optical variability. Thus we have a model for the orientation of jet based entirely on optical data.
The radio jet of OJ287 has been monitored since 1980. Here we add recent data on the orientation of the radio jet to the data obtained from literature. We find that the jet has rotated by more than 40 degrees in the sky but it has not followed the previously proposed precessing jet models. However, within errors of the model, the jet has followed the binary black hole model for the whole period from 1980 to 2010. This is a significant extra proof for the correctness of the underlying binary model.
In the binary model also the spin of the primary black hole has been recently determined . The variation of the spin axis does not match the changes of the radio jet axis. Thus we conclude that at least in OJ287, the jet is launched in the direction of the axis the accretion disk, not in the direction of the spin axis of the black hole if the two directions differ from each other.

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