Quasi-Periodic Changes in the Parsec-Scale Jet of 3C345

Details Quasi-Periodic Changes in the Parsec-Scale Jet of 3C345 Quasi-Periodic Changes in the Parsec-Scale Jet of 3C345

2003-11-07

arxiv.org/abs/astro-ph/0311182v1

Astronomy and Astrophysics

Astrophysics

To be published in "Future Directions in High Resolution Astronomy" (A Celebration of the 10th Anniversary of the VLBA), ASP C

Scientific paper

We have observed the QSO 3C345 with VSOP at 1.6GHz and 5GHz and with the VLBA at 22GHz and 43GHz, with 24 epochs in total, from 1997.40 to 1999.69. This study, combined with previous observations, reveals periodic changes in the parsec-scale jet. This quasi-periodicity can be found in the initial position angles, the trajectories and the flux density evolution of the jet components, with a period of about 9 years. This period should reflect the dynamics of the material in the central region of 3C345 and it is possibly related to a putative binary black hole in the center of this object.

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