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A Counterjet in the Nucleus of Centaurus A

Published online by Cambridge University Press:  25 May 2016

D.L. Jones ,
S.J. Tingay ,
R.A. Preston ,
D.L. Jauncey ,
J.E. Reynolds ,
J.E.J. Lovell ,
P.M. Mcculloch ,
A.K. Tzioumis ,
M.E. Costa  and
D.W. Murphy
...Show all authors
D.L. Jones
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
S.J. Tingay
Affiliation:
2 Mt. Stromlo & Siding Spring Obs., Canberra, ACT, Australia
R.A. Preston
Affiliation:
1 Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA
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
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 (NGC 5128) is the nearest giant radio galaxy. It is a Fanaroff-Riley type 1 (low luminosity) radio source, but the compact radio source in the nucleus is strong enough that VLBI imaging has been possible with both the SHEVE array and the VLBA at several frequencies. These observations have detected a sub-parsec scale counterjet. This shows that jet formation in at least some FR I sources is intrinsically two-sided over very small distances and the radio jets in Centaurus A are probably only moderately relativistic. We also find evidence that the center of activity in Centaurus A is partially obscured by a disk or torus of dense plasma.

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 23 - 24
Copyright
Copyright © Kluwer 1996 

References

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