117 citations · 223 across the 10 of their papers we have counts for
10 papers
Emissivity line ratios for [Mn III] and spectral diagnostics of H II regions
Zher Samak, Sultana N. Nahar, Anil K. Pradhan
We present the first theoretical emission-line study of Mn III as potential determinant of physical conditions and manganese abundance. We compute atomic data for a set of Mn III l…
The OVI mystery: mismatch between X-ray and UV column densities
Smita Mathur, Fabrizio Nicastro, Anjali Gupta +4
The UV spectra of Galactic and extragalactic sightlines often show OVI absorption lines at a range of redshifts, and from a variety of sources from the Galactic circumgalactic medi…
The FeII emission in active galactic nuclei: excitation mechanisms and location of the emitting region
A. O. M. Marinello, A. Rodriguez-Ardila, A. Garcia-Rissmann +2
We present a study of FeII emission in the near-infrared region (NIR) for 25 active galactic nuclei (AGNs) to obtain information about the excitation mechanisms that power it and t…
Fine structure collision strengths and line ratios for [Ne V] in infrared and optical sources
Michael Dance, Ethan Palay, Sultana N. Nahar +1
Improved collisions strengths for the mid-infrared and optical transitions in Ne V are presented. Breit-Pauli R-Matrix calculations for electron impact excitation are carried out w…
A Near-Infrared Template Derived from I Zw 1 for the FeII Emission in Active Galaxies
A. Garcia-Rissmann, A. Rodriguez-Ardila, T. A. A. Sigut +1
In AGN spectra, a series of FeII multiplets form a pseudo-continuum that extends from the ultraviolet to the near-infrared (NIR). This emission is believed to originate in the Broa…
Recombination Rate Coefficients for KLL Di-electronic Satellite Lines of Fe XXV and Ni XXVII
S. N. Nahar, J. Oelgoetz, A. K. Pradhan
The unified method for total electron-ion recombination is extended to study the dielectronic satellite (DES) lines. These lines, formed from radiative decay of autoionizing states…