The Sub-Pc Scale Accretion Disk of Ngc 4258
Source: Astrophysics and Space Science, Volume 295, Numbers 1-2, January 2005 , pp. 285-289(5)
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.
Document Type: Research Article
Affiliations: 1: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, USA, Email: email@example.com 2: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, USA,
Publication date: January 2005