A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio SOurces - I

2); (2) Shanghai Obs; (3) ATNF; (4) Univ of W. Australia; (5) MSSSO; (6) Univ of Tasmania; (7) HartRAO; (8) JPL; (9) ISAS; A. K. Tzioumis (3)

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A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio SOurces - I

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arxiv astro-ph/9709128 v1 submitted 1997-09-14 astro-ph

Z.-Q. Shen (1 , 2) , T.-S. Wan (2) , J. M. Moran (1) , D. L. Jauncey (3) , J. E. Reynolds (3) , A. K. Tzioumis (3) , R. G. Gough (3)

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R. H. Ferris (3) M. W. Sinclair (3) D.-R. Jiang (2) X.-Y. Hong (2) S.-G. Liang (2) M. E. Costa (4) S. J. Tingay (5) P. M. McCulloch (6) J. E. J. Lovell (6) E. A. King (6) G. D. Nicolson (7) D. W. Murphy (8) D. L. Meier (8) T. D. van Ommen (8) P. G. Edwards (9) ((1) CfA USA (2) Shanghai Obs P. R. China (3) ATNF Australia (4) Univ of W. Australia (5) MSSSO (6) Univ of Tasmania (7) HartRAO South Africa (8) JPL (9) ISAS Japan)

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keywords sourcescompactweregamma-rayradioshowedcore-jetevidence

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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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