Parsec-scale structures of radio galaxies in the 2-Jy sample

In this paper we present the results of VLBI observations of six radio galaxies belonging to the 2-Jy sample. The selected objects are 3C17, PKS 0620−52, PKS 0625−35, PKS 1318−43, PKS 1333−33 and 3C317. The first is a high power radio galaxy and the remainder are all low power objects. Our observations were carried out with a set of different arrays and frequencies, and cover a range of resolutions from a few mas to a few tens of mas. Parsec-scale images are presented and discussed in the light of unification for radio loud galaxies. Estimates for the intrinsic plasma speeds in these objects in the proximity of the parsecscale core and their orientation to the line of sight are in agreement with the predictions from unified models and with their optical and X-ray properties. We will use Ho = 50 km s−1Mpc−1, qo = 0 and S ∝ ν−α throughout the paper.