Abstract
We report the discovery of a radio-loud flat-spectrum QSO at z = 5.47 with properties similar to those of the EGRET γ-ray blazars. This source is the brightest radio QSO at z > 5, with a parsec-scale radio jet and a black hole mass estimate ≳1010 M☉. 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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