A Relativistic Jet in the Radio-quiet Quasar PG 1407+263

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Abstract
We present the results of a multiepoch radio monitoring campaign measuring the milliarcsecond structure of the jet in the radio-quiet quasar PG 1407+263. This is the highest sensitivity, highest resolution multiyear study of a distant active galaxy. The observations are naturally explained in terms of a beamed relativistic jet, some of whose fluctuations in flux density can be ascribed to interaction with the narrow-line region of the quasar. The optical properties of PG 1407+263, in particular the low equivalent widths of the emission lines, may be related to the fact that we are viewing this quasar almost pole-on, giving us a direct view into its broad-line region.
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