Discovery of a Subparsec Radio Counterjet in the Nucleus of Centaurus A | Zendy

Dayton L. Jones | Zendy; S. J. Tingay | Zendy; D. W. Murphy | Zendy; David L. Meier | Zendy; D. L. Jauncey | Zendy; J. E. Reynolds | Zendy; A. K. Tzioumis | Zendy; R. A. Preston | Zendy; Peter M. McCulloch | Zendy; M. E. Costa | Zendy; A. J. Kemball | Zendy; G. D. Nicolson | Zendy; J. F. H. Quick | Zendy; Edward King | Zendy; J. E. J. Lovell | Zendy; R. W. Clay | Zendy; R. H. Ferris | Zendy; R. G. Gough | Zendy; M. W. Sinclair | Zendy; S. P. Ellingsen | Zendy; P. G. Edwards | Zendy; P. A. Jones | Zendy; T. D. van Ommen | Zendy; P. Harbison | Zendy; V. Migenes | Zendy

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Discovery of a Subparsec Radio Counterjet in the Nucleus of Centaurus A

Author(s) -

Dayton L. Jones,

S. J. Tingay,

D. W. Murphy,

David L. Meier,

D. L. Jauncey,

J. E. Reynolds,

A. K. Tzioumis,

R. A. Preston,

Peter M. McCulloch,

M. E. Costa,

A. J. Kemball,

G. D. Nicolson,

J. F. H. Quick,

Edward King,

J. E. J. Lovell,

R. W. Clay,

R. H. Ferris,

R. G. Gough,

M. W. Sinclair,

S. P. Ellingsen,

P. G. Edwards,

P. A. Jones,

T. D. van Ommen,

P. Harbison,

V. Migenes

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310183

Subject(s) - centaurus a , physics , astrophysics , very long baseline interferometry , radio galaxy , astronomy , torus , jet (fluid) , active galactic nucleus , opacity , galaxy , geometry , optics , thermodynamics , mathematics

A sub-parsec scale radio counterjet has been detected in the nucleus of theclosest radio galaxy, Centaurus A (NGC 5128), with VLBI imaging at 2.3 and 8.4GHz. This is one of the first detections of a VLBI counterjet and provides newconstraints on the kinematics of the radio jets emerging from the nucleus ofCen A. A bright, compact core is seen at 8.4 GHz, along with a jet extendingalong P.A. 51 degrees. The core is completely absorbed at 2.3 GHz. Our imagesshow a much wider gap between the base of the main jet and the counterjet at2.3 GHz than at 8.4 GHz and also that the core has an extraordinarily invertedspectrum. These observations provide evidence that the innermost 0.4-0.8 pc ofthe source is seen through a disk or torus of ionized gas which is opaque atlow frequencies due to free-free absorption.Comment: 3 pages, 2 postscript figures, scheduled for publication in August 1, 1996 issue of Ap.J. Letter

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