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Article
The Sub-Pc Scale Accretion Disk of Ngc 4258
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 im...
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Chapter
The Sub-PC Scale Accretion Disk of NGC 4258
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 im...
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Article
Shocks in the Radio Photospheres of Long Period Variables Stars
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Chapter and Conference Paper
Proper Motions of H2O Masers in W49(N) and the Distance to the Galactic Center
A distance of R 0 = 7.6 ±1.6 kpc for the galactic center is given by comparison of expansion parallax of a cluster of H2O masers in W49(N) with the kinematic distance of that source. Data from add...