178 citations · 539 across the 16 of their papers we have counts for
10 papers · 1 filter
H-, He-like recombination spectra -- V: On the dependence of the simulated line intensities on the number of electronic levels of the atoms
F. Guzmán, M. Chatzikos, G. Ferland
This paper presents a study of the dependence of the simulated intensities of recombination lines from hydrogen and helium atoms on the number of -resolved principal quantum…
H-, He-like recombination spectra III: -changing collisions in highly-excited Rydberg states and their impact on the radio, IR and optical recombination lines
F. Guzmán, M. Chatzikos, P. A. M. van Hoof +4
At intermediate to high densities, electron (de-)excitation collisions are the dominant process for populating or depopulating high Rydberg states. In particular, the accurate know…
Which Stars are Ionizing the Orion Nebula ?
C. R. O'Dell, W. Kollatschny, G. J. Ferland
The common assumption that Theta-1-Ori C is the dominant ionizing source for the Orion Nebula is critically examined. This assumption underlies much of the existing analysis of the…
Implications of Coronal Line Emission in NGC 4696
M. Chatzikos, R. J. R. Williams, G. J. Ferland +7
We announce a new facility in the spectral code CLOUDY that enables tracking the evolution of a cooling parcel of gas with time. For gas cooling from temperatures relevant to galax…
The Nature of the H2-Emitting Gas in the Crab Nebula
C. T. Richardson, J. A. Baldwin, G. J. Ferland +4
Understanding how molecules and dust might have formed within a rapidly expanding young supernova remnant is important because of the obvious application to vigorous supernova acti…
Pumping up the [N I] nebular lines
G. J. Ferland, W. J. Henney, C. R. O'Dell +3
The optical [N I] doublet near 5200 Å is anomalously strong in a variety of emission-line objects. We compute a detailed photoionization model and use it to show that pumping by fa…