VLBI observations of 21 extragalactic radio sources - Search for superluminal sources in the mid-southern hemisphere

We present the results of VLBI observations of 21 extragalactic radio sourc es carried out with an ad-hoc VLBI array including Shanghai, Urumqi: Noto, and Hartebeesthoek radio telescopes. Eleven sources are imaged, three of th em for the first time with VLBI. Correlated flux densities of the remaining ten sources are given. From comparison with data taken at earlier epochs, the apparent superluminal motion is confirmed in four sources (0420-014. 05 52+398, 1334-127 and 2345-167) and two more superluminal candidates (1504-1 66 and 2243-123) are found. The physical parameters of the four superlumina l sources are derived.