46 citations · 221 across the 14 of their papers we have counts for
3 papers · 1 filter
Improved Fe II emission line models for AGN using new atomic datasets
A. Sarkar, G. J. Ferland, M. Chatzikos +6
Understanding the Fe II emission from Active Galactic Nuclei (AGN) has been a grand challenge for many decades. The rewards from understanding the AGN spectra would be immense, inv…
Emission line ratios of Fe III as astrophysical plasma diagnostics
Sibasish Laha, Niall B. Tyndall, Francis P. Keenan +4
Recent state-of-the-art calculations of A-values and electron impact excitation rates for Fe III are used in conjunction with the Cloudy modeling code to derive emission line inten…
Ultraviolet emission lines of Si II in quasars --- investigating the "Si II disaster"
Sibasish Laha, Francis P. Keenan, Gary J. Ferland +2
The observed line intensity ratios of the Si II 1263 and 1307 Å multiplets to that of Si II 1814\,Å in the broad line region of quasars are both an order of magnitude larger than t…