88 citations · 251 across the 4 of their papers we have counts for
7 papers
Imaging an Event Horizon: submm-VLBI of a Super Massive Black Hole
Sheperd Doeleman, Eric Agol, Don Backer +20
A long standing goal in astrophysics is to directly observe the immediate environment of a black hole with angular resolution comparable to the event horizon. Realizing this goal w…
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…
Imaging the Ionized Disk of the High-Mass Protostar Orion-I
M. J. Reid, K. M. Menten, L. J. Greenhill +1
We have imaged the enigmatic radio source-I (Orion-I) in the Orion-KL nebula with the VLA at 43 GHz with 34 mas angular resolution. The continuum emission is highly elongated and i…
The Distance to the Perseus Spiral Arm in the Milky Way
Y. Xu, M. J. Reid, X. W. Zheng +1
We have measured the distance to the massive star-forming region W3OH in the Perseus spiral arm of the Milky Way to be 1.95 0.04 kilo-parsecs ( km). This d…
Sub-arcsecond sub-mm continuum observations of Orion-KL
H. Beuther, Q. Zhang, L. J. Greenhill +9
We present the first 865 mu continuum image with sub-arcsecond resolution obtained with the Submillimeter Array. These data resolve the Orion-KL region into the hot core, the nearb…