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High-Velocity Maser Emission From Shocks Along Spiral Waves In The Circumnuclear Disk Of NGC 4258

Published online by Cambridge University Press:  12 April 2016

Eyal Maoz
Eyal Maoz*
Affiliation:
Astronomy Department, University of Californiaat Berkeley, CA 94720

Abstract

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VLBI observations of H2O maser line emission from the central sub-parsec region of the galaxy NGC 4258 have recently revealed a remarkably well-defined, rapidly rotating molecular disk which is viewed nearly edge–on. We show that the peculiar clustering of the maser sources into several distinct clumps which are almost equally spaced apart from one another, and the striking asymmetry in the high-velocity maser spectrum can be naturally explained by spiral activity in the disk.

Type
Part 13. Large and Small Scale Disks in AGN
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 630 - 633
Copyright
Copyright © Astronomical Society of the Pacific 1997

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