The Astrophysical Journal
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As part of an ongoing effort to observe high-energy γ-ray blazars with VLBI, we have produced 8 and 2 GHz VLBI images, at 10 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 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-1c from the outermost component inward. (H0 = 100 h km s-1 Mpc-1, q0 = 0.5 throughout this Letter). These velocities contradict a previously published very high superluminal velocity of 26 h-1c for this source.
Piner, B., & Kingham, K. A. (1997). A Slower Superluminal Velocity for the Quasar 1156+295. The Astrophysical Journal, 485, L61. Retrieved from https://poetcommons.whittier.edu/phys/63