Shock waves and mass outflow in the Orion molecular cloud: Observations of far-infrared emission lines of carbon monoxide, hydroxyl and ammonia

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Emission Spectra, High Resolution, Infrared Radiation, Infrared Spectrometers, Mass Flow, Orion Nebula, Shock Waves, Spectrum Analysis, Ammonia, Carbon Monoxide, Cryogenic Cooling, Cryogenic Fluids, Fabry-Perot Interferometers, Hydroxyl Compounds, Spectral Resolution

Scientific paper

A high-resolution far-infrared spectrometer was designed, constructed and used for the detection of several far-infrared emission lines of CO, OH and NH3. The spectrometer operates in the 36-180 microns wavelength range and is capable of providing spectral resolution of one part in 5000. Observations of the region in the center of the Orion molecular cloud which contains the Kleinmann/Low nebula, using the instrument mentioned above, resulted in detections of emission that represent the first detections of interstellar molecules at far-infrared wavelengths. The CO and OH lines arise in hot, shock-excited gas previously detected in the infrared lines of molecular hydrogen at two microns and 12 microns.

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