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Issue A&A
Volume 436, Number 2, June III 2005
Page(s) L13 - L16
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500112



A&A 436, L13-L16 (2005)
DOI: 10.1051/0004-6361:200500112

Letter

High-resolution radio imaging of the most distant radio quasar SDSS J0836+0054

S. Frey1, Z. Paragi2, L. Mosoni3 and L. I. Gurvits2

1  FÖMI Satellite Geodetic Observatory, PO Box 585, 1592 Budapest, Hungary
    e-mail: frey@sgo.fomi.hu
2  Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands
    e-mail: [zparagi;lgurvits]@jive.nl
3  Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary
    e-mail: mosoni@konkoly.hu

(Received 11 March 2005 / Accepted 19 April 2005)

Abstract
We observed SDSS J0836+0054, the most distant radio-loud quasar known at present (z=5.774) with the European Very Long Baseline Interferometry (VLBI) Network at the 5 GHz frequency on 2003 November 4. The source is compact at the milli-arcsecond (mas) angular scale with a flux density of 0.34 mJy. The observations with the Very Large Array (VLA) made on the consecutive day support a conclusion that the radio emission from SDSS J0836+0054 is essentially confined within the central 40 pc. Based on our phase-referenced VLBI observation, we obtained the astrometric position of the source accurate to ~2 mas.


Key words: techniques: interferometric -- radio continuum: galaxies -- galaxies: active -- cosmology: observations -- quasars: individual: SDSS J0836+0054 -- quasars: individual: J0836+0052

SIMBAD Objects



© ESO 2005


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