Spectral survey of the Orion Molecular Cloud Core in the region of 455-505 GHz

Araki, M.; Ohishi, M.; White, Glenn J.; Higginbottom, N. S. and Greaves, J. S. (2000). Spectral survey of the Orion Molecular Cloud Core in the region of 455-505 GHz. In: Atomic and Molecular Data for Astrophysics: New Developments, Case Studies and Future Needs, 24th meeting of the IAU, 07-19 Aug 2000, Manchester, UK.

URL: http://cdsads.u-strasbg.fr/abs/2000IAUJD...1E..62A

Abstract

A spectral survey in the region of 455-508 GHz has been carried out toward the Hot Core region at the center of the Orion Molecular Cloud using the JCMT 15 m telescope. Beam size of this observation is 10", which agree with size of the core. 313 spectral lines were observed in this survey. The lines are numerically dominated by rotational transitions of large organic molecules. Using an LTE rotational temperature abundance analysis, some of the derived column densities show a systematic increase over previously calculated values. Particularly, (CH₃)₂O, C₂H₃CN and C₂H₅CN are extremely abundant. For SO₂, two lines in detected 35 lines were assigned to the vibrational excited state. The two lines have a Boltzmann distribution in the inside of vibrational excited state, i.e. the Boltzmann distribution is independent from that of the vibrational ground state. This phenomenon indicates that this vibrational excited state was not made by collision and was made by excitation with emission from IRc2.

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