Discovery of a Sub-Parsec Radio Counterjet in the Nucleus of Centaurus A

Details Discovery of a Sub-Parsec Radio Counterjet in the Nucleus of Centaurus A Discovery of a Sub-Parsec Radio Counterjet in the Nucleus of Centaurus A

1996-06-04

arxiv.org/abs/astro-ph/9606023v1

Astrophys.J.466:L63,1996

Astronomy and Astrophysics

Astrophysics

3 pages, 2 postscript figures, scheduled for publication in August 1, 1996 issue of Ap.J. Letters

Scientific paper

10.1086/310183

A sub-parsec scale radio counterjet has been detected in the nucleus of the closest radio galaxy, Centaurus A (NGC 5128), with VLBI imaging at 2.3 and 8.4 GHz. This is one of the first detections of a VLBI counterjet and provides new constraints on the kinematics of the radio jets emerging from the nucleus of Cen A. A bright, compact core is seen at 8.4 GHz, along with a jet extending along P.A. 51 degrees. The core is completely absorbed at 2.3 GHz. Our images show a much wider gap between the base of the main jet and the counterjet at 2.3 GHz than at 8.4 GHz and also that the core has an extraordinarily inverted spectrum. These observations provide evidence that the innermost 0.4-0.8 pc of the source is seen through a disk or torus of ionized gas which is opaque at low frequencies due to free-free absorption.

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