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Paper: VLBI Observations of a Megamaser in a Seyfert Galaxy IC 2560
Volume: 144, Radio Emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 164
Page: 237
Authors: Nakai, N.; Inoue, M.; Hagiwara, Y.; Miyoshi, M.; Diamond, P. J.
Abstract: 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 x 10^6 M_\odot 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.
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