The Superluminal Character of the Compact Steep Spectrum Quasar 3C 216

Creators: Venturi, T.; Pearson, T. J.; Barthel, P. D.; Herbig, T.

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Abstract

We report the results of fourth epoch VLBI observations at 4990.99 MHz, with a resolution of ~1 mas, of the compact steep-spectrum quasar 3C216. Superluminal motion in this object is confirmed. Although a constant superluminal expansion at v_(app) = 3.9c ± 0.6 is not ruled out, our four epoch data are suggestive of component deceleration. In this paper we discuss the possibility of deceleration taking into account the compact steep spectrum nature of this quasar. We conclude that (a) compact steep spectrum sources may show the same beaming and orientation phenomena as extended sources and (b) the compact steep spectrum nature of the source could offer an explanation for the possible deceleration.

Additional Information

© 1992 European Southern Observatory. Provided by the NASA Astrophysics Data System. Received January 18, accepted August 8, 1992. We are grateful to the U.S. and European VLBI networks for allocating observing time for these observations, and Margo and Hugh Aller for providing their fiux-density monitoring data in advance of publication. We thank Prof. R. and C. Fanti and Dr. F. Mantovani for comments and suggestions on the manuscript. The work was supported in part by NSF grant AST-8814554 and by the CNR NATO fellowship 203.02.19. TJP is grateful for the hospitality of the Kapteyn Laboratory, Groningen, and thanks the Netherlands Organization for Pure Research for a Visitor Grant.

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