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 (11)

• Herschel observations of EXtra-Ordinary Sources: Analysis of the HIFI 1.2 THz Wide Spectral Survey Toward Orion KL I. Methods
• Discovery of superthermal hydroxyl (OH) in the HH211 outflow
• Herschel Far-Infrared Spectral-mapping of Orion BN/KL Outflows: Spatial distribution of excited CO, H2O, OH, O and C+ in shocked gas
• SWAS Observations of Water in Molecular Outflows
• The ISO LWS high resolution spectral survey towards Sagittarius B2
• The mid-infrared molecular inventory towards Orion IRc2
• Mid- and far-infrared fine-structure line sensitivities to hypothetical variability of the fine-structure constant
• Sulfur-bearing species in molecular clouds
• Physical parameters for Orion KL from modelling its ISO high resolution far-IR CO line spectrum
• The GBT 67 -- 93.6 GHz Spectral Line Survey of Orion-KL
• First Detection of Radio Recombination Lines of Ions Heavier than Helium