446 citations · 1.8k across the 75 of their papers we have counts for
6 papers · 2 filters
Close-coupling calculations of low-energy inelastic and elastic processes in He collisions with H: A comparative study of two potential energy surfaces
T. G. Lee, C. Rochow, R. Martin +7
The two most recently published potential energy surfaces (PESs) for the HeH complex, the so-called MR (Muchnick and Russek) and BMP (Boothroyd, Martin, and Peterson) surfaces,…
The Origin of Fe II Emission in AGN
J. A. Baldwin, G. J. Ferland, K. T. Korista +2
We used a very large set of models of broad emission line (BEL) clouds in AGN to investigate the formation of the observed Fe II emission lines. We show that photoionized BEL cloud…
Physical Conditions in Orion's Veil
N. P. Abel, C. L. Brogan, G. J. Ferland +3
Orion's veil consists of several layers of largely neutral gas lying between us and the main ionizing stars of the Orion nebula. It is visible in 21cm H I absorption and in optical…
Grain size distributions and photo-electric heating in ionized media
P. A. M. van Hoof, J. C. Weingartner, P. G. Martin +2
Ever since the pioneering study of Spitzer, it has been widely recognized that grains play an important role in the heating and cooling of photo-ionized environments. A detailed co…
The Broad Emission Line Regions of Quasars - current status and future prospects
Gary Ferland
The spectrum emitted by the Broad Emission Line Regions of Active Galactic Nuclei can measure the luminosity of the central object and the chemical composition of the interstellar…
C/C ratio in planetary nebulae from the IUE archives
R. H. Rubin, G. J. Ferland, E. E. Chollet +1
We investigated the abundance ratio of C/C in planetary nebulae by examining emission lines arising from \ion{C}{3} $2s2p ^3P_{2,1,0} \to 2s^2 ^1S_0$. Spectra were re…