The Sub-Pc Scale Accretion Disk of Ngc 4258 |
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Authors: | E. M. L. Humphreys A. L. Argon L. J. Greenhill M. J. Reid J. M. Moran |
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Affiliation: | (1) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, USA |
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Abstract: | Water megamasers have been found to trace parsec/sub-parsec, circumnuclear accretion disks in several AGN (e.g., Circinus, NGC 1068 & NGC 4258). High-spatial (0.5 mas) and velocity resolution (0.2 km s–1) VLBA imaging of the disks reveals thin, warped pannekoeken (pancake)-style structures as opposed to thick tori in the inner regions of the central engines (40 000 Rsch). In this contribution, I will describe some current investigations into the dynamical and physical attributes of the water maser disk in NGC 4258, as revealed by VLBA, VLA and Effelsberg monitoring over 8 years. |
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Keywords: | NGC 4258 water masers accretion disks AGN |
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