Open AccessSubparsec-scale structure and evolution of Centaurus A (NGC5128).
Author(s) -
D. L. Jauncey,
S. J. Tingay,
R. A. Preston,
J. E. Reynolds,
J. E. J. Lovell,
P. M. McCulloch,
A. K. Tzioumis,
M. E. Costa,
D. W. Murphy,
D. L. Meier,
D. L. Jones,
S. W. Amy,
James Biggs,
David Blair,
R. W. Clay,
Philip Edwards,
S. P. Ellingsen,
RH Ferris,
R. G. Gough,
P. Harbison,
Peter N. Jones,
E. A. King,
A. J. Kemball,
V. Migenes,
G. D. Nicolson,
M. W. Sinclair,
T. D. van Ommen,
R. M. Wark,
Graeme L. White
Publication year - 1995
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.92.25.11368
Subject(s) - centaurus a , southern hemisphere , very long baseline interferometry , parsec , physics , astrophysics , jet (fluid) , interferometry , scale (ratio) , active galactic nucleus , very long baseline array , core (optical fiber) , proper motion , astronomy , galaxy , optics , stars , quantum mechanics , thermodynamics
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.