The First VLBI Survey of Compact Radio Sources in the Southern Hemisphere at 5~GHz

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Session 8 -- Surveys and Cosmology
Display presentation, Monday, June 12, 1995, 9:20am - 6:30pm

[8.02] The First VLBI Survey of Compact Radio Sources in the Southern Hemisphere at 5~GHz

Z.-Q. Shen (CfA; Shanghai Astronomical Obs.), T.-S. Wan (Shanghai Astronomical Obs.), J. M. Moran (CfA), D.-R. Jiang, X.-Y. Hong (Shanghai Astronomical Obs.), D. L. Jauncey, J. E. Reynolds, A. K. Tzioumis, V. Migenes, R. H. Ferris (ATNF), G. D. Nicolson (Hart RAO), R. A. Preston, D. L. Meier, D. L. Jones, D. W. Murphy (JPL), P. M. McCulloch, E. A. King, J. E. J. Lovell (U. Tasmania), M. E. Costa (U. WA), P. G. Edwards, R. W. Clay (U. Adelaide)

We report the results of the first 5~GHz southern hemisphere VLBI observations with SHEVE (Southern Hemisphere VLBI Experiment) network (plus Shanghai) performed during a 50 hour period in November 1992. A sample of 23 extragalactic radio sources were observed. Images of 20 sources and structural information on 2 others (1548+056 and 1814$-$637) were obtained. Of the 20 sources, fifteen showed core$-$jet structure (0048$-$097, 0106+013, 0235+164, 0420$-$014, 0458$-$020, 1104$-$445, 1334$-$127, 1504$-$166, 1730$-$130, 1741$-$038, 1921$-$293, 2134+004, 2145+067, 2223$-$052, and 2345$-$167), one had a two$-$sided jet (1510$-$089) and 4 were unresolved at the level of $\sim$0.6~mas (0104$-$408, 1144$-$379, 1519$-$273 and 2216$-$038). There were no compact doubles. Eleven of the 16 core$-$jet (including the two$-$sided jet) sources showed evidence of bent jets. We also found evidence, based on the temporal variability of radio flux density and previous images, for superluminal motion in 4 sources: 0106+013(8.2c), 0420$-$014(3.9c), 1334$-$127(4.5c) and 2345$-$167(5.0c).

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