The radiation from stars and active galactic nuclei (AGNs) creates photodissociation regions
(PDRs) and X-ray-dominated regions (XDRs), where the chemistry or heating is dominated …

Planets form and obtain their compositions in disks of gas and dust around young stars. The
chemical compositions of these planet-forming disks regulate all aspects of planetary …

Abstract The DESI Legacy Imaging Surveys (http://legacysurvey. org/) are a combination of
three public projects (the Dark Energy Camera Legacy Survey, the Bei**g–Arizona Sky …

To constrain the nature of the very first stars, we investigate the collapse and fragmentation
of primordial, metal-free gas clouds. We explore the physics of primordial star formation by …

▪ Abstract We review recent theoretical results on the formation of the first stars in the
universe, and emphasize related open questions. In particular, we discuss the initial …

The interstellar medium of galaxies is the reservoir out of which stars are born and into
which stars inject newly created elements as they age. The physical properties of the …

The minimum mass that a virialized gas cloud must have in order to be able to cool in a
Hubble time is computed, using a detailed treatment of the chemistry of molecular hydrogen …

Increasingly, uncertainties in predictions from galaxy formation simulations (at sub-Milky
Way masses) are dominated by uncertainties in stellar evolution inputs. In this paper, we …

Magnetohydrodynamic shock waves in molecular clouds ADS Classic is now deprecated. It
will be completely retired in October 2019. This page will automatically redirect to the new …

Molecular absorption and emission bands dominate the visible, infrared, and submillimeter
spectra of most objects with associated gas. These observations reveal a surprisingly rich …