The Sub-Pc Scale Accretion Disk of Ngc 4258

Details The Sub-Pc Scale Accretion Disk of Ngc 4258 The Sub-Pc Scale Accretion Disk of Ngc 4258

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.295..285h&link_type=abstract

Astrophysics and Space Science, Volume 295, Issue 1-2, pp. 285-289

Astronomy and Astrophysics

Astrophysics

3

Ngc 4258, Water Masers, Accretion Disks, Agn

Scientific paper

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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