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9.12. Global disk oscillations and kinematics of mega-maser sources

Published online by Cambridge University Press:  25 May 2016

A.T. Okazaki
A.T. Okazaki*
Affiliation:
College of General Education, Hokkai-Gakuen University, Toyohira-ku, Sapporo 062, Japan

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Megamasers provide a powerful tool to probe the innermost few parsecs of active galactic nuclei (AGNs). In particular, for AGNs with large inclination angles, only maser sources enable to directly study the structure and dynamics of the region inside the supposed obscuring tori, which are considered to be optically thick from the infrared to the X-ray bands. For example, the VLBI observations of the water megamaser sources at the center of NGC 4258 have provided not only the compelling evidence for the presence of a central supermassive black hole but also the detailed information on the spatial and velocity distribution of the maser sources (Miyoshi et al. 1995; Nakai et al. 1995).

Type
Part III. Black Holes and Central Activity
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 405 - 406
Copyright
Copyright © Kluwer 1998 

References

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Okazaki, A.T., 1996, Astron. Astrophys. 316, L5.Google Scholar
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