471 citations · 474 across the 4 of their papers we have counts for
4 papers
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…
Radio and Infrared Properties of Dust-Enshrouded Wolf-Rayet Stars
J. D. Monnier, L. J. Greenhill, P. G. Tuthill +1
This paper discusses our ongoing efforts to characterize dust-enshrouded Wolf-Rayet (WR) stars in the radio and infrared. We have used the Very Large Array to measure the broadband…
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…
A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk
J. R. Herrnstein, J. M. Moran, L. J. Greenhill +6
The water maser in the mildly active nucleus in the nearby galaxy NGC4258 traces a thin, nearly edge-on, subparsec-scale Keplerian disk. Using the technique of very long baseline i…