Search
Now showing items 1-9 of 9
The Geometry of and Mass Accretion Rate through the Maser Accretion Disk in NGC 4258
(IOP Publishing, 2005)
A maximum likelihood analysis of the NGC 4258 maser positions and velocities reveals a ∼ 2 σ deviation from Keplerian motion in the projected rotation curve of the high-velocity features, corresponding to a ∼ 9 km s−1, or ...
Evidence for a Geometrically Thick Self‐Gravitating Accretion Disk in NGC 3079
(IOP Publishing, 2005)
We have mapped, for the first time, the full velocity extent of the water maser emission in NGC 3079. The largely north-south distribution of emission, aligned with a kpc-scale molecular disk, and the segregation of blue- ...
A Green Bank Telescope Search for Water Masers in Nearby Active Galactic Nuclei
(IOP Publishing, 2004)
Using the Green Bank Telescope, we have conducted a survey for 1.3 cm water maser emission toward the nuclei of nearby active galaxies, the most sensitive large survey for H2O masers to date. Among 145 galaxies observed, ...
A Search for H 2 O Maser Emission in Southern Active Galactic Nuclei and Star‐forming Galaxies: Discovery of a Maser in the Edge‐on Galaxy IRAS F01063?8034
(IOP Publishing, 2002)
We report the cumulative results of five surveys for H2O maser emission at 1.35 cm wavelength in 131 active galactic nuclei (AGNs) and star-forming galaxies, conducted at the Parkes Observatory between 1993 and 1998. We ...
The IC 133 Water Vapor Maser in the Galaxy M33: A Geometric Distance
(IOP Publishing, 2004)
We report on the results of a 14 year long VLBI study of proper motions in the IC 133 H2O maser source in the galaxy M33. The method of Ordered Motion Parallax was used to model the 3-dimensional structure and dynamics of ...
A Warped Accretion Disk and Wide‐Angle Outflow in the Inner Parsec of the Circinus Galaxy
(IOP Publishing, 2003)
We present the first VLBI maps of H2O maser emission (λ1.3 cm) in the nucleus of the Circinus Galaxy, constructed from data obtained with the Australia Telescope Long Baseline Array. The maser emission traces a warped, ...
The Discovery of H2O Maser Emission in Seven AGN and at High Velocities in the Circinus Galaxy
(IOP Publishing, 2002)
We report the discovery of H2O maser emission at 1.35 cm wavelength in seven active galactic nuclei (at distances up to < 80 Mpc) during a survey conducted at the 70-m diameter antenna of the NASA Deep Space Network near ...
Accelerations of Water Masers in NGC 4258
(IOP Publishing, 2000)
The water masers in NGC4258 delineate the structure and dynamics of a sub-parsec-diameter accretion disk around a supermassive black hole. VLBA observations provide precise information about the positions in the plane of ...
Proper Motion of Water Masers Associated with IRAS 21391+5802: Bipolar Outflow and an AU‐Scale Dusty Circumstellar Shell
(IOP Publishing, 2000)
We present VLBA observations of water maser emission associated with the star forming region IRAS 21391+5802, which is embedded in a bright rimmed cometary globule in IC1396. The angular resolution of the maps is ∼ 0.8 ...