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A far-infrared molecular and atomic line survey of the Orion KL region

A far-infrared molecular and atomic line survey of the Orion KL region

Publication date: 16 August 2006

Authors: Lerate, M.R. et al.

Journal: MNRAS
Volume: 370
Issue: 2
Page: 597-628
Year: 2006

Copyright: Royal Astronomical Society

We have carried out a high spectral resolution (lambda/Deltalambda ~ 6800-9700) line survey towards the Orion Kleinmann-Low (KL) cluster from 44 to 188 micron. The observations were taken with the Long Wavelength Spectrometer (LWS) in Fabry-Pérot mode, on board the Infrared Space Observatory (ISO). A total of 152 lines are clearly detected and a further 34 features are present as possible detections. The spectrum is dominated by the molecular species H2O, OH and CO, along with [OI] and [CII] lines from photodissociation region (PDR) or shocked gas and [O III] and [NIII] lines from the foreground M42 HII region. Several isotopic species, as well as NH3, are also detected. HDO and H3O+ are tentatively detected for the first time in the far-infrared (FIR) range towards Orion KL. A basic analysis of the line observations is carried out, by comparing with previous measurements and published models and deriving rotational temperatures and column densities in the case of the molecular species.

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