III Zw 2: Superluminal motion and compact lobe expansion in a Seyfert galaxy

Details III Zw 2: Superluminal motion and compact lobe expansion in a Seyfert galaxy III Zw 2: Superluminal motion and compact lobe expansion in a Seyfert galaxy

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..110b&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Physics

Scientific paper

What causes the difference between radio-loud and radio-quiet quasars and how is this connected to the host galaxies? So far all radio-loud quasars and relativistic jets with superluminal motion have only been detected in typical radio galaxies with early type host galaxies. With multi-epoch VLBI observations at 43 GHz we have now for the first time discovered superluminal motion on sub-parsec scales in the Seyfert I galaxy III Zw 2, classified as a spiral. The lower limit for the apparent expansion speed is 1.25 +/- 0.09 c. Prior to this rapid expansion we have seen a period of virtually no expansion on VLBI-scales with an expansion speed less than 0.04 c - this, we speculate, could indicate a phase where the jet interacts with dense material, possibly the molecular torus. Since III Zw 2 is also part of a sample of so called radio-intermediate quasars (RIQ), the detected superluminal motion confirms the predictions for this source by Falcke, Patnaik, & Sherwood (1996), based on the argument that RIQs could be relativistically boosted jets in radio-weak quasars and Seyfert galaxies. For the question of the nature of the radio-loud/ radio-quiet dichotomy in quasars this means that radio-weak and radio-loud quasars can indeed have central engines that are in many respects very similar. Their optical properties are almost indistinguishalbe and both types of quasars con produce relativistic jets on sub-parsec scale in their nuclei. This also raises the question if Seyfert jets are launched relativistically and slowed down and disrupted already on the sub-parsec scale.

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