1995•Proceedings of the National Academy of SciencesOpen access
Subparsec-scale structure and evolution of Centaurus A (NGC5128).
D. L. Jauncey, Steven John Tingay, R. A. Preston, J. E. Reynolds, J E Lovell, P M McCulloch, A K Tzioumis, M E Costa, D W Murphy, D L Meier, D L Jones, SW Amy, Biggs Jd, D. G. Blair, R. W. Clay, PG Edwards, S. P. Ellingsen, RH Ferris, R. Gough, P. Harbison, P. A. Jones, E. A. King, AJ Kemball, Migenes, G. D. Nicolson, MW Sinclair, TD van Ommen, RM Wark, G. L. White
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Abstract
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 Hemisphere array, representing a 3.3-year monitoring effort. The nuclear radio jet is approximately 50 milliarcseconds in extent, or at the 3.5-megaparsec distance of NGC5128, approximately 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 us to unambiguously identify the self-absorbed core located at the southwestern end of the jet.