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High-Mass Protostellar Candidates. II. Density Structure from Dust Continuum and CS Emission
We present a detailed 1.2 mm continuum and CS spectral line study of a large sample of 69 massive star forming regions in very early stages of evolution, most of them prior to building up an
Massive molecular outflows
With the aim of understanding the role of massive outflows in high-mass star formation, we mapped in the 12 CO $J=2-1$ transition 26 high-mass star-forming regions at very early stages of their
High-Mass Protostellar Candidates. I. The Sample and Initial Results
We describe a systematic program aimed at identifying and characterizing candidate high-mass protostellar objects (HMPOs). Our candidate sample consists of 69 objects selected by criteria based on
Probing the evolution of molecular cloud structure: From quiescence to birth
Context. Probability distribution of densities is a fundamental measure of molecular cloud structure, containing information on how the material arranges itself in molecular clouds. Aims. We derive
CH3OH and H2O masers in high-mass star-forming regions
We present a comparison of Class ii CH3OH (6.7 GHz) and H2O (22.2 GHz) masers at high spatial resolution in a sample of 29 massive star-forming regions. Absolute positions of both maser types are
IRAS 05358+3543: Multiple outflows at the earliest stages of massive star formation
We present a high-angular-resolution molecular line and millimeter continuum study of the massive star formation site IRAS 05358+3543. Observations with the Plateau de Bure Interferometer in CO 1{0,
High-Mass Starless Cores
We report the identification of a sample of potential high-mass starless cores (HMSCs). The cores were discovered by comparing images of fields containing candidate high-mass protostellar objects
Giant molecular filaments in the Milky Way
Throughout the Milky Way, molecular clouds typically appear filamentary, and mounting evidence indicates that this morphology plays an important role in star formation. What is not known is to what
The dynamics and star-forming potential of the massive Galactic centre cloud G0.253+0.016
Context. The massive infrared dark cloud G0.253+0.016 projected ∼45 pc from the Galactic centre contains ∼10 5 Mof dense gas whilst being mostly devoid of observed star-formation tracers. Aims. Our