Kavli Affiliate: Peter Michelson
| First 5 Authors: Roger W. Romani, David Sowards-Emmerd, Lincoln Greenhill, Peter Michelson,
| Summary:
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.
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