VLBI imaging of extremely high redshift quasars at 5 GHz
Z. Paragi, S. Frey, L. I. Gurvits, K. I. Kellermann, R. T. Schilizzi, R. G. McMahon, I. M. Hook, I. I. K. Pauliny-Toth
Abstract
We present very long baseline interferometry (VLBI) images of ten very high redshift (z>3) 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 (z=4.72). It is barely resolved with an angular resolution of about 2.0*1.4 mas.
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