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Monitoring the Jet in Centaurus A at 0.1 Parsec Resolution

Published online by Cambridge University Press:  25 May 2016

R.A. Preston ,
S.J. Tingay ,
D.L. Jauncey ,
J.E. Reynolds ,
J.E.J. Lovell ,
P.M. Mcculloch ,
A.K. Tzioumis ,
M.E. Costa ,
D.W. Murphy  and
D.L. Meier
...Show all authors
R.A. Preston
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
S.J. Tingay
Affiliation:
2 Mt. Stromlo & Siding Spring Obs., Canberra, ACT, Australia
D.L. Jauncey
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
J.E. Reynolds
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
J.E.J. Lovell
Affiliation:
4 University of Tasmania, Hobart, Tasmania, Australia
P.M. Mcculloch
Affiliation:
4 University of Tasmania, Hobart, Tasmania, Australia
A.K. Tzioumis
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
M.E. Costa
Affiliation:
5 University of Western Australia, Nedlands, WA, Australia
D.W. Murphy
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
D.L. Meier
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
D.L. Jones
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
R.W. Clay
Affiliation:
6 University of Adelaide, Adelaide, SA, Australia
P.G. Edwards
Affiliation:
7 Institute of Space & Astronautical Science, Sagamihara, Japan
S.P. Ellingsen
Affiliation:
4 University of Tasmania, Hobart, Tasmania, Australia
R.H. Ferris
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
R.G. Gough
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
P. Harbison
Affiliation:
8 British Aerospace Australia, Canberra, ACT, Australia
P.A. Jones
Affiliation:
9 University of Western Sydney, Kingswood, NSW, Australia
E.A. King
Affiliation:
4 University of Tasmania, Hobart, Tasmania, Australia
A.J. Kemball
Affiliation:
10 Hartebeesthoek Radio Astr. Obs., Krugersdorp, South Africa
V. Migenes
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
G.D. Nicolson
Affiliation:
10 Hartebeesthoek Radio Astr. Obs., Krugersdorp, South Africa
M.W. Sinclair
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
T.D. Van OMMEN
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
R.M. Wark
Affiliation:
3 Australia Telescope National Facility, Epping, NSW, Australia
G.L. White
Affiliation:
9 University of Western Sydney, Kingswood, NSW, Australia

Abstract

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Centaurus A is the closest active extragalactic radio source, at a distance of approximately 3.5 Mpc, and is identified with the peculiar elliptical galaxy NGC 5128. As such it is a very important target for observations of the small-scale (sub-parsec) and large-scale (kpc) structures in extragalactic jets. Here we present Mk-II VLBI observations made at 8.4 GHz over a 4.3 year period from early 1991 until mid-1995, as well as a 4.8 GHz observation that was co-eval with one of the 8.4 GHz observations. All of the observations were made with the SHEVE array except for the last observation which was made with the VLBA. The dual-frequency observations identify the core of the radio source, while the multi-epoch observations show the complex structural evolution at a resolution of 0.1 pc. Subluminal motion of ≈ 0.15c is evident. Structural changes are observed on time scales shorter than four months.

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 21 - 22
Copyright
Copyright © Kluwer 1996