▪ Abstract The physical conditions in molecular clouds control the nature and rate of star
formation, with consequences for planet formation and galaxy evolution. The focus of this …

We have searched for interstellar conformer I glycine (NH 2 CH 2 COOH), the simplest
amino acid, in the hot molecular cores Sgr B2 (N-LMH), Orion KL, and W51 e1/e2. An …

Cloud environment is thought to play a critical role in determining the mechanism of
formation of massive stars. In this contribution we review the physical characteristics of the …

Sufficiently massive clumps of molecular gas collapse under self-gravity and fragment to
spawn a cluster of stars that have a range of masses. We investigate observationally the …

We describe the first three-dimensional simulation of the gravitational collapse of a massive,
rotating molecular cloud that includes heating by both non-ionizing and ionizing radiation …

We present VLBI observations of 6.7 and 12.2 GHz methanol masers in 14 star-forming
regions, namely NGC 7538, S 252, W 75N, W 48, G 31.28+ 0.06, S 231, S 255, S 269, Mon …

We report measurement of the trigonometric parallax of W51 Main/South using the Very
Long Baseline Array. We measure a value of 0.185±0.010 mas corresponding to a distance …

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 …

We review recent observational results in the eld of high-mass star formation. Special
attention is given to the earliest evolutionary stages of massive stars through the study of hot …

Aims. In order to understand the observed molecular diversity in high-mass star-forming
regions, we have to determine the underlying physical and chemical structure of those …