▪ Abstract Turbulence affects the structure and motions of nearly all temperature and density
regimes in the interstellar gas. This two-part review summarizes the observations, theory …

Partially ionized plasmas are found across the Universe in many different astrophysical
environments. They constitute an essential ingredient of the solar atmosphere, molecular …

Observations indicate that massive stars in the Galaxy form in regions of very high surface
density, Σ∼ 1 g cm-2. Clusters containing massive stars and globular clusters have a …

We present numerical simulations and explore scalings and anisotropy of compressible
magnetohydrodynamic (MHD) turbulence. Our study covers both gas-pressure-dominated …

Massive stars (with mass m*> 8 solar masses M⊙) are fundamental to the evolution of
galaxies, because they produce heavy elements, inject energy into the interstellar medium …

The origin of the empirical laws of galactic scale star formation is considered in view of the
self-similar nature of interstellar gas and the observation that most local clusters are …

We use our own, recently developed pre–main-sequence evolutionary tracks to investigate
the star formation histories of relatively nearby associations and clusters. We first employ …

We investigate the formation and evolution of giant molecular clouds (GMCs) by the collision
of convergent warm neutral medium (WNM) streams in the interstellar medium, in the …

Millimeter wavelength observations are presented of NGC 1333 IRAS 4, a group of highly
embedded young stellar objects in Perseus, that reveal motions of infall, outflow, rotation …

Hydrodynamic supersonic turbulence can only prevent local gravitational collapse if the
turbulence is driven on scales smaller than the local Jeans lengths in the densest regions …