98 citations · 191 across the 13 of their papers we have counts for
6 papers
Self-consistent grain depletions and abundances I: The Orion Nebula as a test case
Chamani Gunasekera, Xihan Ji, Marios Chatzikos +2
Atomic species in the interstellar medium (ISM) transition out of their gas phase mainly by depletion onto dust. In this study, we examine if there is any change to the spectral li…
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…
H, He-like recombination spectra II: -changing collisions for He Rydberg states
F. Guzmán, N. R. Badnell, R. J. R. Williams +3
Cosmological models can be constrained by determining primordial abundances. Accurate predictions of the He I spectrum are needed to determine the primordial helium abundance to a…
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…
Accurate determination of the free-free Gaunt factor; I - non-relativistic Gaunt factors
P. A. M. van Hoof, R. J. R. Williams, K. Volk +5
Modern spectral synthesis codes need the thermally averaged free-free Gaunt factor defined over a very wide range of parameter space in order to produce an accurate prediction for…
On the Observability of Optically Thin Coronal Hyperfine Structure Lines
Marios Chatzikos, Gary Ferland, Robin Williams +1
We present Cloudy calculations for the intensity of coronal hyperfine lines in various environments. We model indirect collisional and radiative transitions, and quantify the colli…