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SMA Imaging of the Maser Emission from the H30 Radio Recombination Line in MWC349A
Jonathan Weintroub, James M. Moran, David J. Wilner +3
We used the Submillimeter Array to map the angular distribution of the H30 recombination line (231.9 GHz) in the circumstellar region of the peculiar star MWC349A. The resolutio…
Toward a New Distance to the Active Galaxy NGC 4258: II. Centripetal Accelerations and Investigation of Spiral Structure
E. M. L. Humphreys, M. J. Reid, L. J. Greenhill +2
We report measurements of centripetal accelerations of maser spectral components of NGC 4258 for 51 epochs spanning 1994 to 2004. This is the second paper of a series, in which the…
The structure of the accretion disk in NGC 4258 derived from observations of its water vapor masers
Jim Moran, Liz Humphreys, Lincoln Greenhill +2
A wealth of new information about the structure of the maser disk in NGC 4258 has been obtained from a series of 18 VLBA observations spanning three years, as well as from 32 addit…
Discovery of Water Maser Emission in Five AGN and a Possible Correlation Between Water Maser and Nuclear 2-10 keV Luminosities
Paul T. Kondratko, Lincoln J. Greenhill, James M. Moran
We report the discovery of water maser emission in five active galactic nuclei (AGN) with the 100-m Green Bank Telescope (GBT). The positions of the newly discovered masers, measur…
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…