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[48.03] Measurement of the VLBI Core Proper Motion of OJ 287 at 43 GHz

S.G. Jorstad, A.P. Marscher (IAR Boston U.), M.L. Lister (NRAO), A.M. Stirling (U. Central Lancashire, UK), H. Terasranta (Metsahovi Radio Obs., Finland)

We observed the BL Lac object OJ 287 and nearby in angle extragalactic radio source J0856+211 with the VLBA at 10 epochs from April 1999 to April 2001. Using these data, we measure position of the VLBI core of OJ 287 at 43 GHz relative to the phase-referencing source with an accuracy of about 0.05 mas. During this period OJ 287 underwent two prominent flares at 22/37 GHz according to Metsahovi Radio Observatory data. The outbursts are accompanied by ejections of superluminal components. We determine whether the VLBI core remains stationary or moves as outbursts occur and as superluminal knots progress downstream.

This research was funded in part by US National Science Foundation grant AST-0098579.

The author(s) of this abstract have provided an email address for comments about the abstract: jorstad@bu.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.