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The Nuclear Region of a Megamaser in a Southern AGN, NGC 5793: Parsec-Scale Structure and OH Absorption

Published online by Cambridge University Press:  12 April 2016

Y. Hagiwara ,
R. Kawabe ,
N. Nakai  and
P.J. Diamond
Y. Hagiwara
Affiliation:
The Graduate University for Advanced Studies, NRO, Minamimaki-mura, Minamisaku-gun, Nagano 384-13
R. Kawabe
Affiliation:
Nobeyama Radio Observatory, Minamimaki-mura, Minamisaku-gun, Nagano 384-13
N. Nakai
Affiliation:
Nobeyama Radio Observatory, Minamimaki-mura, Minamisaku-gun, Nagano 384-13
P.J. Diamond
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, U.S.A.

Abstract

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We have carried out VLBA observations of the OH absorption lines toward the nucleus of the active galaxy, NGC 5793, which is known to have a megamaser in its center. We have also successfully made its continuum image at the L band. It reveals the typical “core-jet” structure on parsec scales. Uniform values of optical depth at each point against the background radio continuum source shows that the column densities of the OH absorbing cloud uniformly distributes around the radio compact nucleus.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 233 - 234
Copyright
Copyright © Astronomical Society of the Pacific 1998

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