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astro-ph2003
Recent Progress on a New Geometric Distance to NGC 4258
E. M. L. Humphreys, A. L. Argon, L. J. Greenhill +2
We report on our ongoing, high-resolution study of H2O masers in the innermost parsec of NGC 4258. Over thirty epochs of VLBA and VLA data, taken over six years, are being used to…
astro-ph2000
Accretion and Outflow Traced by Water Masers in the Circinus AGN
L. J. Greenhill, J. M. Moran, R. S. Booth +7
The first VLBI images of water maser emission in the Circinus Galaxy AGN show both a warped, edge-on accretion disk and an outflow 0.1 to 1 pc from the central engine. The inferred…