Q0906+6930: The Highest-Redshift Blazar
arXiv:astro-ph/0406252 · doi:10.1086/423201
Abstract
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.
To appear in the Astrophysical Journal Letters. 5pp, 3figures