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

Abstract

We have carried out a high spectral resolution line survey towards the Orion Kleinmann-Low (KL) cluster from 44-188 um. The observations were taken with the Long Wavelength Spectrometer (LWS) in Fabry-Perot 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 PDR or shocked gas and [OIII], [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 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. The complexity of the region requires more sophisticated models for the interpretation of all the line observations.

Accepted by MNRAS 2006 April 28

References in corpus (2)

• OH maser disc and outflow in the Orion-BN/KL region
• Far-IR Excited OH Lines from Orion KL Outflows

Cited by in corpus (5)

• Discovery of superthermal hydroxyl (OH) in the HH211 outflow
• SWAS Observations of Water in Molecular Outflows
• The ISO LWS high resolution spectral survey towards Sagittarius B2
• Mid- and far-infrared fine-structure line sensitivities to hypothetical variability of the fine-structure constant
• Physical parameters for Orion KL from modelling its ISO high resolution far-IR CO line spectrum