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The Counterjet in the Nucleus of Centaurus A

Published online by Cambridge University Press:  12 April 2016

R.A. Preston ,
S.J. Tingay ,
D.L. Jones ,
D.W. Murphy ,
D.L. Meier ,
D.L. Jauncey ,
J.E. Reynolds ,
A.K. Tzioumis ,
J.E.J. Lovell  and
P.M. McCulloch
...Show all authors
R.A. Preston
Affiliation:
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, U.S.A.
S.J. Tingay
Affiliation:
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, U.S.A.
D.L. Jones
Affiliation:
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, U.S.A.
D.W. Murphy
Affiliation:
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, U.S.A.
D.L. Meier
Affiliation:
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, U.S.A.
D.L. Jauncey
Affiliation:
CSIRO, Australia Telescope National Facility, NSW 2121, Australia
J.E. Reynolds
Affiliation:
CSIRO, Australia Telescope National Facility, NSW 2121, Australia
A.K. Tzioumis
Affiliation:
CSIRO, Australia Telescope National Facility, NSW 2121, Australia
J.E.J. Lovell
Affiliation:
University of Tasmania, Hobart, Tasmania 7001, Australia
P.M. McCulloch
Affiliation:
University of Tasmania, Hobart, Tasmania 7001, Australia
M.E. Costa
Affiliation:
University of Tasmania, Hobart, Tasmania 7001, Australia
G. Nicolson
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, Krugersdorp, South Africa

Abstract

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We have observed the nucleus of Centaurus A with the VLBA and the SHEVE arrays, individually and in combination. In sensitive experiments at 8.4 GHz which use both arrays together we have detected components in a sub-parsec-scale counterjet. The counterjet is also seen in 2.3 and 22 GHz images. The nuclear region appears to be partially obscured by a free-free absorbing structure of about 1 pc in extent. The jet axis appears to lie at a 50°–70° angle to our line of sight.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 91 - 92
Copyright
Copyright © Astronomical Society of the Pacific 1998

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