Mildly relativistic motion in the radio quiet quasar PG 1351+640

ABSTRACT Measuring the proper motion of emission component in radio-quiet quasars (RQQs) could help to distinguish between origins radio and understand whether jet production mechanism is same radio-loud RQQs. PG 1351+640 one few RQQs suitable for studies: it has two compact components on milli-arcsec scales, a flat-spectrum core steep-spectrum jet; both are ≳2 mJy at 5 GHz well suited Very Long Baseline Array (VLBA) observations. We compare recent VLBA observations with that made seventeen years ago find no significant change core-jet separation 2005 2015 (a 0.003 mas yr−1). However, increased significantly 2022, inferring velocity 0.063 yr−1, which corresponds an apparent transverse $0.37\, c$ . The result suggests RQQ mildly relativistic oriented relatively small viewing angle.