292 citations · 688 across the 8 of their papers we have counts for
8 papers
Toward a New Geometric Distance to the Active Galaxy NGC 4258. III. Final Results and the Hubble Constant
Liz Humphreys, Mark Reid, Jim Moran +2
We report a new geometric maser distance estimate to the active galaxy NGC 4258. The data for the new model are maser line-of-sight velocities and sky positions from 18 epochs of V…
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…
Toward a New Geometric Distance to the Active Galaxy NGC4258: I. VLBI Monitoring of Water Maser Emission
A. L. Argon, L. J. Greenhill, M. J. Reid +2
We report a three year, 18 epoch, VLBI monitoring study of H2O masers in the sub-parsec, warped, accretion disk within the NGC4258 AGN. Our immediate goals are to trace the geometr…
Full-Polarization Observations of OH Masers in Massive Star-Forming Regions: I. Data
Vincent L. Fish, Mark J. Reid, Alice L. Argon +1
We present full-polarization VLBA maps of the ground-state, main-line, 2 Pi 3/2, J = 3/2 OH masers in 18 Galactic massive star-forming regions. This is the first large polarization…
The IC133 Water Vapor Maser in the Galaxy M33: A Geometric Distance
A. L. Argon, L. J. Greenhill, J. M. Moran +3
We report on the results of a 14 year long VLBI study of proper motions in the IC133 H2O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the…