A Slower Superluminal Velocity for the Quasar 1156+295

Abstract

As part of an ongoing effort to observe high energy gamma-ray blazars with VLBI, we have produced 8 and 2 GHz VLBI images, at ten epochs spanning the years 1988 to 1996, of the quasar 1156+295. The VLBI data have been taken from the Washington VLBI correlator's geodetic database. We have detected detected four components and have measured their apparent speeds to be 8.8 +/- 2.3, 5.3 +/- 1.1, 5.5 +/- 0.9, and 3.5 +/- 1.2 h^{-1}c from the outermost component inwards. (H_{0}=100h km/(s Mpc), q_{0}=0.5 throughout paper). These velocities contradict a previously published very high superluminal velocity of 26 h^{-1}c for this source.

8 pages, 2 figures, accepted to ApJ Letters

Cited by in corpus (13)

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• First Results from MASIV: The Micro-Arcsecond Scintillation-Induced Variability Survey
• Relativistic Jets in The Radio Reference Frame Image Database I: Apparent Speeds from the First Five Years of Data
• VSOP and Ground-based VLBI Imaging of the TeV Blazar Markarian 421 at Multiple Epochs
• Changes in the measured image separation of the gravitational lens system, PKS 1830-211
• A relativistic helical jet in the gamma-ray AGN 1156+295
• The Fastest Relativistic Jets: VLBA Observations of Blazars with Apparent Speeds Exceeding 25c
• Radio structure of the blazar 1156+295 with sub-pc resolution
• Serendipitous VLBI detection of rapid, large-amplitude, intraday variability in QSO 1156+295
• Neutrinos from active galactic nuclei as a diagnostic tool
• Geodetic VLBI Observations of EGRET Blazars
• Helical motions in the jet of blazar 1156+295
• SAND: An automated VLBI imaging and analysing pipeline - I. Stripping component trajectories