A submillimeter study of CH in Orion KL

Details A submillimeter study of CH in Orion KL A submillimeter study of CH in Orion KL

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.288p&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

Scientific paper

Three pairs of submillimeter lambda-doubled lines of the methylidyne, CH, radical have been observed in Orion KL with the Herschel HIFI instrument as a part of the HEXOS program. Emission is observed from the ground state cross ladder pair at 533/537 GHz while the pairs at 1471/1477 and 1657/1661 GHz originating from the upper levels at 533/537 GHz are all in absorption. The line profiles are consistent with the systemic velocity of the molecular cloud and do not show the outflow seen in HF and H_2O. The well-established relationship between CH and H_2 makes these transitions a sensitive probe of the local gas conditions.

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