Open AccessRadio structure of the most distant radio‐detected quasar at the 10‐mas scale
Author(s) -
Frey S.,
Mosoni L.,
Paragi Z.,
Gurvits L. I.
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06869.x
Subject(s) - physics , very long baseline interferometry , quasar , astrophysics , redshift , gravitational lens , astronomy , angular diameter , sky , angular resolution (graph drawing) , active galactic nucleus , interferometry , source counts , flux (metallurgy) , radio telescope , stars , galaxy , materials science , mathematics , combinatorics , metallurgy
We present a high‐resolution radio image of SDSS 0836+0054, identified recently as the most distant radio‐detected quasar at a redshift of z = 5.82 . The observation was carried out with 10 antennas of the European Very Long Baseline Interferometry (VLBI) Network, spread from Europe to China and South Africa, at 1.6‐GHz frequency on 2002 June 8. The source was detected with a total flux density of 1.1 mJy, equal to its flux density measured in the Very Large Array (VLA) Faint Images of the Radio Sky at Twenty‐Centimeters (FIRST) survey. We found no indication of multiple images produced by gravitational lensing. The radio structure of the quasar at ∼10‐mas angular resolution appears somewhat resolved. It resembles the radio structure typical for lower‐redshift radio‐loud active galactic nuclei. We obtained so far the best astrometric position of the source with an accuracy better than 8 mas, limited mainly by the structural effects in the phase‐reference calibrator source.