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Astron. Astrophys. 354, 7-16 (2000)

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Radio imaging of core-dominated high redshift quasars

Peter D. Barthel 1, Marianne Vestergaard 2,3,4 and Colin J. Lonsdale 5

1 Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands
2 NBIfAFG, Copenhagen University Observatory, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
3 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
4 Department of Astronomy, The Ohio State University, 140 W. 18th Av., Columbus, OH 43210, USA (current address)
5 MIT Haystack Observatory, Westford, MA 01886, USA

Received 16 July 1999 / Accepted 17 November 1999


VLA imaging at kiloparsec-scale resolution of sixteen core-dominated radio-loud QSOs is presented. Many objects appear to display variable radio emission and their radio morphologies are significantly smaller than those of steep-spectrum quasars, consistent with these objects being observed at sight lines close to their (relativistic, [FORMULA] 4-7) jet axes. The usefulness of the radio source orientation indicator [FORMULA], being defined as ratio of radio core and rest frame optical V-band luminosity, is confirmed.

Key words: galaxies: active – galaxies: jets – galaxies: quasars: general

Send offprint requests to: Peter Barthel (pdb@astro.rug.nl)

© European Southern Observatory (ESO) 2000

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