A spectral survey of the Orion Nebula from 455-507 GHz

White, Glenn J.; Araki, M.; Greaves, J. S.; Ohishi, M. and Higginbottom, N. S. (2003). A spectral survey of the Orion Nebula from 455-507 GHz. Astronomy & Astrophysics, 407(2) pp. 589–607.

DOI: https://doi.org/10.1051/0004-6361:20030841

Abstract

The results of a submillimetre wavelength spectral line survey between 455.1-507.4 GHz of the Orion-KL hot cloud core are reported. A total of 254 lines were detected to a main beam brightness temperature sensitivity T_mb ~ 1-3 K. The detected lines are identified as being associated with 30 different molecular species or their isotopomeric variants. The strongest line detected was the J = 4-3 transition of the CO molecule. Apart from abundant diatomic rotors such as CO and CS, the spectrum is dominated by SO, SO₂ and CH₃OH and large organic molecules such as (CH₃)₂O, CH₃CN, C₂H₃CN, C₂H₅CN and HCOOCH₃ which make up ~72% of the total number of lines; unidentified lines ~13%; and other lines the remaining ~15% of the total. Rotational temperatures and column densities derived using standard rotation diagram analysis techniques were found to range from 70-300 K, and 10¹⁴-10¹⁷ cm² respectively.

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