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The Sub-Pc Scale Accretion Disk of Ngc 4258

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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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Authors and Affiliations

  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, USA

    E. M. L. Humphreys, A. L. Argon, L. J. Greenhill, M. J. Reid & J. M. Moran

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  1. E. M. L. Humphreys
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  2. A. L. Argon
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  3. L. J. Greenhill
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  4. M. J. Reid
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  5. J. M. Moran
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Correspondence to E. M. L. Humphreys.

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Humphreys, E.M.L., Argon, A.L., Greenhill, L.J. et al. The Sub-Pc Scale Accretion Disk of Ngc 4258. Astrophys Space Sci 295, 285–289 (2005). https://doi.org/10.1007/s10509-005-3728-4

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  • DOI: https://doi.org/10.1007/s10509-005-3728-4

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