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

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

1997-09-14

arxiv.org/abs/astro-ph/9709128v1

Astronomy and Astrophysics

Astrophysics

39 pages including 7 ps figures and 5 tables, Latex, to appear in AJ

Scientific paper

10.1086/118621

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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