183 citations · 772 across the 20 of their papers we have counts for
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Prevalence of High X-ray Obscuring Columns among AGN that Host HO Masers
Lincoln J. Greenhill, Avanti Tilak, Grzegorz Madejski
Of 104 AGN known to exhibit HO maser emission, X-ray data that enable estimation of column densities, or lower limits, are available for 42. Contributing to this, we report ana…
On the Detectability of the Hydrogen 3-cm Fine Structure Line from the EoR
Mark Dijkstra, Adam Lidz, Jonathan R. Pritchard +4
A soft ultraviolet radiation field, 10.2 eV < E <13.6 eV, that permeates neutral intergalactic gas during the Epoch of Reionization (EoR) excites the 2p (directly) and 2s (indirect…
Real-Time Calibration of the Murchison Widefield Array
D. A. Mitchell, L. J. Greenhill, R. B. Wayth +5
The interferometric technique known as peeling addresses many of the challenges faced when observing with low-frequency radio arrays, and is a promising tool for the associated cal…
The Parsec-scale Accretion Disk in NGC 3393
Paul T. Kondratko, Lincoln J. Greenhill, James M. Moran
We present a Very Long Baseline Interferometry image of the water maser emission in the nuclear region of NGC3393. The maser emission has a linear distribution oriented at a positi…
A Deep 0.3-10 keV Spectrum of the HO Maser Galaxy IC 2560
Avanti Tilak, Lincoln Greenhill, Chris Done +1
We present a new XMM-Newton spectrum of the Seyfert 2 nucleus of IC 2560, which hosts HO maser emission from an inclined Keplerian accretion disk. The X-ray spectrum shows so…
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…