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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 anExpand
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 theirExpand
The Atacama Pathfinder EXperiment (APEX) : a new submillimeter facility for southern skies
APEX, the Atacama Pathfinder EXperiment, has been successfully commissioned and is operational. This novel submillimeter telescope is located at 5107 m altitude on Llano de Chajnantor in the ChileanExpand
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 onExpand
The earliest phases of high-mass star formation: a 3 square degree millimeter continuum mapping of Cygnus X
Aims. Our current knowledge of high-mass star formation is mainly based on follow-up studies of bright sources found by IRAS, and is thus biased against its earliest phases, inconspicuous at infraredExpand
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 areExpand
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,Expand
A recalibration of the interstellar ammonia thermometer
Les coefficients de vitesse pour l'excitation rotationnelle de para-NH 3 et ortho-NH 3 par para-H 2 (J=0) sont presentes pour les temperatures cinetiques 15≤T≤300 K. Les resultats sont utilises pourExpand
Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)
The discovery of amino acids in meteorites and the detection of glycine in samples returned from a comet to Earth suggest that the interstellar chemistry is capable of producing such complex organicExpand
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 objectsExpand