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VLBI Observations of a Megamaser in a Seyfert Galaxy IC 2560

Published online by Cambridge University Press:  12 April 2016

N. Nakai ,
M. Inoue ,
Y. Hagiwara ,
M. Miyoshi  and
P. J. Diamond
N. Nakai
Affiliation:
Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-13, Japan
M. Inoue
Affiliation:
Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-13, Japan
Y. Hagiwara
Affiliation:
Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-13, Japan
M. Miyoshi
Affiliation:
Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory, 2-12 Hoshigaoka, Mizusawa, Iwate 023, Japan
P. J. Diamond
Affiliation:
National Radio Astronomy Observatory, Socorro, NM 87801, U.S.A.

Abstract

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VLBA observations of water-vapor maser emission in the active nucleus of a Seyfert 2, IC 2560, show linear velocity gradient along the north-south elongation, suggesting a compact rotating disk. The binding mass density within the disk is 7.7 × 106 M⊙ pc−3. We are also monitoring the velocity variations of the maser features with single dish telescopes. By combining the velocity drift with the linear velocity gradient, we would be able to determine the rotation speed and radius of the nuclear disk, and hence the central mass.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 237 - 238
Copyright
Copyright © Astronomical Society of the Pacific 1998

References

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