Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-09
Astrophys.J. 610 (2004) L9-12
Astronomy and Astrophysics
Astrophysics
To appear in the Astrophysical Journal Letters. 5pp, 3figures
Scientific paper
10.1086/423201
We report the discovery of a radio-loud flat-spectrum QSO at z=5.47 with properties similar to those of the EGRET gamma-ray blazars. This source is the brightest radio QSO at z>5, with a pc-scale radio jet and a black hole mass estimate >10^{10}M_\odot. It appears to be the most distant blazar discovered to date. High energy observations of this source can provide powerful probes of the background radiation in the early universe.
Greenhill Lincoln
Michelson Peter
Romani Roger W.
Sowards-Emmerd David
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