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VLBI Observations of Central Region in NGC 3079

Published online by Cambridge University Press:  12 April 2016

Satoko Satoh ,
M. Inoue ,
N. Nakai ,
K. M. Shibata ,
S. Kameno ,
V. Migenes  and
P. J. Diamond
Satoko Satoh
Affiliation:
National Astronomical Observatory, JAPAN
M. Inoue
Affiliation:
National Astronomical Observatory, JAPAN
N. Nakai
Affiliation:
National Astronomical Observatory, JAPAN
K. M. Shibata
Affiliation:
National Astronomical Observatory, JAPAN
S. Kameno
Affiliation:
National Astronomical Observatory, JAPAN
V. Migenes
Affiliation:
National Astronomical Observatory, JAPAN
P. J. Diamond
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, U.S.A.

Abstract

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We present multi-frequency observations towards the nucleus of NGC 3079 using both Japan VLBI Network (J-Net) and the VLBA including phased VLA and Effelsberg. We detected two continuum components at 1.4 and 8.4 GHz, and determined the spectral indices for each component. Further, we found several H ɪ absorption features towards the continuum components whose velocity gradient is opposite to the galaxy rotation. Assuming rotation, the central mass is estimated to be 3 × 106M⊙. The water maser distribution extends in North-South direction along the galactic disk, while no clear indication of a Keplerian rotating disk was found.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 219 - 220
Copyright
Copyright © Astronomical Society of the Pacific 1998

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