We describe the 2023 release of the spectral synthesis code Cloudy. Since the previous
major release, migrations of our online services motivated us to adopt git as our version …

The James Webb Space Telescope (JWST, Gardner et al. 2006) is a 6.5 m space telescope
launched in 2021 December and is developed by the National Aeronautics and Space …

Abstract The PhotoDissociation Region Toolbox provides comprehensive, easy-to-use,
public software tools and models that enable an understanding of the interaction of the light …

We present JWST/MIRI MRS spectroscopy of NGC 7319, the largest galaxy in the Stephan's
Quintet, observed as part of the Early Release Observations (ERO). NGC 7319 hosts a type …

Understanding the Fe II emission from active galactic nuclei (AGNs) has been a grand
challenge for many decades. The rewards from understanding the AGN spectra would be …

ABSTRACT SDSS J083942. 11+ 380526.3 () is an iron low-ionization broad absorption
lines quasar that exhibits visible Balmer absorption lines (H), implying a significant …

The complexity of the energy levels in Fe ii has made it difficult to theoretically interpret its
observational emission spectrum. However, addressing this challenge could provide …

Abstract This Technical Review encapsulates the methods and numerical techniques that
have been so successfully used over the years to study the electron scattering of atoms and …

The partition function, U, the number of available states in an atom or molecules, is crucial
for understanding the physical state of any astrophysical system in thermodynamic …

We use the PyNeb 1.1. 16 Python package to evaluate the atomic datasets available for the
spectral modeling of [Fe ii] and [Fe iii], which list level energies, A-values, and effective …