Old VLBI Data Shed New Light on Superluminal Controversy

Details Old VLBI Data Shed New Light on Superluminal Controversy Old VLBI Data Shed New Light on Superluminal Controversy

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..tsf.c1003h&link_type=abstract

American Physical Society, Joint Fall Meeting of the Texas Sections of the , abstract #C1.003

Physics

Scientific paper

We report old 2.8cm VLBI observations at 0.5-mas resolution of 6 sources (5 quasars) using telescopes at Effelsberg, Haystack, Green Bank, Fort Davis, Owens Valley, and Hat Creek. Correlation and reduction were done with the Caltech Mark-II processor and VLBI software. An epoch 1985.29 image of 1156+295 shows a 2.0-Jy core and a 0.1-Jy jet knot at 1.4 mas in PA 15 degrees (and a weak knot at 2.5 mas in PA 40). Comparison with the 1987.72 image of McHardy et al. (MNRAS, 1990, 246, 305) yields a proper motion of ˜0.3 mas/yr, or a superluminal speed of ˜7c (Ho = 100 km/s/Mpc, qo = 0.5), close to that of Piner and Kingham (1997, ApJ, 485, L61) and ruling out the extreme value of 26c in McHardy et al. (MNRAS, 1993, 261, 464). A 1984.60 image of 1923+210 (no optical ID) shows a 0.8-Jy core and jet knots of 0.5 Jy at 0.5 mas in PA 251, 0.2 Jy at 1.4 mas in PA 255, and 0.1 Jy at 2.4 mas in PA 251. A 1983.78 image of 2037+511 shows a ˜1.2-Jy core and jet knots of ˜0.2 Jy at 0.8 mas in PA 205 and ˜0.1 Jy at 1.4 mas in PA 215. A 1982.44 observation of 4C19.44 shows amplitudes from ˜0.7 to ˜1.5 Jy and non-zero closure phases, indicative of resolved, asymmetric structure. The sources 0221+276 and 4C34.47 went undetected at 1983.78 and 1982.44, respectively.

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