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Astron. Astrophys. 344, 51-60 (1999)

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VLBI imaging of extremely high redshift quasars at 5 GHz

Z. Paragi 1,2, S. Frey 1, L.I. Gurvits 2,3, K.I. Kellermann 4, R.T. Schilizzi 2,5, R.G. McMahon 6, I.M. Hook 7 and I.I.K. Pauliny-Toth 8

1 FÖMI Satellite Geodetic Observatory, P.O. Box 546, H-1373 Budapest, Hungary
2 Joint Institute for VLBI in Europe, P.O. Box 2, 7990 AA, Dwingeloo, The Netherlands
3 Astro Space Center of P.N. Lebedev Physical Institute, 117924 Moscow, Russia
4 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA
5 Leiden Observatory, P.O. Box 9513, 2300 RA, Leiden, The Netherlands
6 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
7 European Southern Observatory, D-85748 Garching, Germany
8 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

Received 13 November 1998 / Accepted 8 January 1999

Abstract

We present very long baseline interferometry (VLBI) images of ten very high redshift ([FORMULA]) quasars at 5 GHz. The sources 0004+139, 0830+101, 0906+041, 0938+119 and 1500+045 were observed in September 1992 using a global VLBI array, while 0046+063, 0243+181, 1338+381, 1428+423 and 1557+032 were observed in October 1996 with the European VLBI Network and Hartebeesthoek, South Africa. Most of the sources are resolved and show asymmetric structure. The sample includes 1428+423, the most distant radio loud quasar known to date ([FORMULA]). It is barely resolved with an angular resolution of about 2.0[FORMULA]1.4 mas.

Key words: galaxies: quasars: general – radio continuum: galaxies – galaxies: active

Send offprint requests to: Z. Paragi, 1st address (paragi@sgo.fomi.hu)

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© European Southern Observatory (ESO) 1999

Online publication: March 10, 1999
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