We describe the 2017 release of the spectral synthesis code CLOUDY, summarizing the
many improvements to the scope and accuracy of the physics which have been made since …

This is a summary of the 2013 release of the plasma simulation code Cloudy. Cloudy
models the ionization, chemical, and thermal state of material that may be exposed to an …

Context. JWST has taken the sharpest and most sensitive infrared (IR) spectral imaging
observations ever of the Orion Bar photodis-sociation region (PDR), which is part of the …

We present the first three-dimensional radiation-magnetohydrodynamic simulations of the
photoionization of a dense, magnetized molecular globule by an external source of …

We investigate the physical cause of the great range in the ionization level seen in the
spectra of narrow-lined active galactic nuclei (AGN). We used a recently developed …

We perform a comprehensive analysis of the planetary nebula (PN) NGC 6781 to investigate
the physical conditions of each of its ionized, atomic, and molecular gas and dust …

ABSTRACT The Orion Bar is one of the nearest and best-studied photodissociation or
photon-dominated regions (PDRs). Observations reveal the presence of H 2 lines from …

We have performed a detailed analysis of the Ring Nebula (NGC 6720) using Hubble Space
Telescope WFC3 images and derived a new three-dimensional model. Existing high …

Herschel PACS and SPIRE images have been obtained of NGC 6720 (the Ring nebula).
This is an evolved planetary nebula with a central star that is currently on the cooling track …

The acquisition of high-quality deep images of planetary nebulae (PNe) has allowed the
detection of a wealth of small-scale features, which highlight the complexity of the formation …