SO(3/2/-2/1) mapping of the Orion KL cloud components

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Molecular Clouds, Sulfur Oxides, Abundance, Data Reduction, Emission Spectra, Molecular Spectroscopy

Scientific paper

This paper presents Orion A map data of the SO(3/2/-2/1) 99.3 GHz emission, which spatially delineate the 8 and 10 km/s ridge clouds, the expanding disk, and the high velocity bipolar-type outflows. The complex line-shape was resolved in six well-defined velocity components, mapped over a 90-in. region around the Kleinmann-Low nebula. The dominant plateau component is broad, hot, small, and located close to IRc2, and the highly red- and blue-shifted emissions are displaced northward of the KL nebula. A map of the (CH3)2O(4/14/-3/03/) line relates this emission to the SO 8 km/s southern ridge cloud. The location of the two ambient cloud condensations, S and NE of the KL nebula, is suggestive of a channeling of the bipolar flow responsible for the shock-excited H2 and CO emissions.

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