A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio SOurces - I
Z. -Q. Shen, T. -S. Wan, J. M. Moran, D. L. Jauncey, J. E. Reynolds, A. K. Tzioumis, R. G. Gough, R. H. Ferris, M. W. Sinclair, D. -R. Jiang, X. -Y. Hong, S. -G. Liang, M. E. Costa, S. J. Tingay, P. M. McCulloch, J. E. J. Lovell, E. A. King, G. D. Nicolson, D. W. Murphy, D. L. Meier, T. D. van Ommen, P. G. Edwards
Abstract
We report the results of a 5 GHz southern hemisphere VLBI survey of compact extragalactic radio sources. These observations were undertaken with the SHEVE array plus Shanghai station in November 1992. A sample of 22 sources was observed and images of 20 of them were obtained. Of the 20 sources imaged, 15 showed core-jet structure, one had a two-sided jet and 4 had only single compact cores. Eleven of the 16 core-jet (including one two-sided jet) sources show some evidence of bent jets. No compact doubles were found. A comparison with previous images and the temporal variability of the radio flux density showed evidence for superluminal motion in 4 of the sources. Five sources were high energy (>100 MeV) gamma-ray sources. Statistical analysis showed the dominance of highly polarized quasars among the detected gamma-ray sources, which emphasizes the importance of beaming effect in the gamma-ray emission.
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