(C-13)O and HCO(+) observations of IRAS sources in L1641

Astronomy and Astrophysics – Astronomy

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Carbon Monoxide, Formaldehyde, Infrared Sources (Astronomy), Molecular Ions, Radio Astronomy, Infrared Astronomy Satellite, Molecular Flow, Molecular Gases, Orion Nebula, Spatial Distribution, Star Formation

Scientific paper

Twenty-eight IRAS sources selected from the IRAS co-added images in L1641 were observed in the (C-13)O (J = 1-0) and HCO(+) (J = 1-0) using the 45 m telescope at the Nobeyama Radio Observatory. The (C-13)O and HCO(+) column densities toward the IRAS sources correlated with each other, and both column densities also correlated with the IRAS color defined by the 12-25-micron flux ratio. Three outflow sources mapped in this study showed well-defined HCO(+) cores with a size of 0.1 pc and a mass of 3-30 solar masses. The most probable explanation of these results is that the molecular dense cores are dissipated by both accretion and outflow during an early stage of stellar evolution.

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