A tentative double-jet model for blazar OJ287
  We try to propose a tentative relativistic jet model for explaining the
entire radio-optical phenomena observed in blazar OJ287, which has been
observed quasi-periodically with a cycle of about 12yr in its optical light
curve. We investigate the currently available theoretical and observational
studies on the phenomena observed in OJ287 and try to find clues to its
double-jet structure. It is found that the kinematic features of its
superluminal components observed at 43GHz and 15GHz could be well interpreted
in terms of a precessing double-jet nozzle model. And the light curves of a few
optical double-peaked outbursts could be interpreted in terms of relativistic
jet models. Both jets precess with the same period of 12yr, equal to the
optical period and the precession of the jets could be originated from the
orbital motion of the binary. Thus the masses of the binary black holes could
be estimated. We also tentatively suggest a comprehensive framework for
understanding the entire phenomena in OJ287 in terms of relativistic jet
models.
