SUBPARSEC-SCALE STRUCTURE AND EVOLUTION OF CENTAURUS-A (NGC5128)

We present a series of 8.4-GHz very-long-baseline radio interferometry images of the nucleus of Centaurus A (NGC5128) made with a Southern H emisphere array, representing a 3.3-year monitoring effort. The nuclea r radio jet is approximate to 50 milliarcseconds in extent, or at the 3.5-megaparsec distance of NGC5128, approximate to 1 parsec in length. Subluminal motion is seen and structural changes are observed on time scales shorter than 4 months. High-resolution observations at 4.8 and 8.4 GHz made in November 1992 reveal a complex morphology and allow u s to unambiguously identify the self-absorbed core located at the sout hwestern end of the jet.