Far infrared spectroscopy of the Orion Nebula

Physics

Scientific paper

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Far Infrared Radiation, Infrared Spectroscopy, Orion Constellation, Electron Density (Concentration), High Resolution, Lear Jet Aircraft, Line Spectra, Spectral Resolution

Scientific paper

A coarse resolution spectrum of the Orion Nebula between 65 and 125 microns is presented which closely fits the color dependence of a 75 K blackbody. A high resolution search for O III at 88.16 microns yields an upper limit below theoretical predictions. Observations were carried out in November, 1974, using the 31 cm gyrostabilized telescope mounted in the NASA Lear jet. The instrument employed was a fully liquid helium cooled grating spectrometer with a 3 mm entrance slit that gave a square beam on the sky, 5 arc minutes in diameter. The results are presented.

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