CO, CS, and HCN in a clustering of reflection nebulae in Monoceros

Astronomy and Astrophysics – Astrophysics

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Carbon Monoxide, Emission Spectra, Interstellar Gas, Millimeter Waves, Molecular Spectra, Nebulae, B Stars, Brightness Temperature, Hydrocyanic Acid, Line Spectra, Stellar Evolution, Sulfur Compounds

Scientific paper

Observations are reported of the 2.6-mm line of CO from an extended region in Monoceros containing a complex of dust clouds as well as a group of reflection nebulae (Mon R2) and where a source of relatively strong millimeter emission from CS and HCN has been found. Lower limits are obtained for the CO and H2 column densities in this region, and five CO emission peaks are identified, each of which is approximately coincident with at least one reflection nebula. Around the position of the strongest peak, extended emission is observed from CS and HCN, suggesting the existence of a rotating core with an H2 density which corresponds to a mass of 5500 solar masses. The CO profiles in the direction of the strongest peak appear to show self-absorption, which may indicate a collapsing cloud.

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