Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982stin...8314032s&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Emission Spectra, Line Spectra, Orion Nebula, C-141 Aircraft, Cooling, Fine Structure, H Ii Regions, Interstellar Matter, Neutral Gases, Oxygen Atoms
Scientific paper
A first set of observations of the (OI) 3P to 3P1 (145.5 micron) transition was obtained. The line was observed both in a beam centered on the Trapezium, and in a 7 times wider beam encompassing most of the Orion Nebula. A wide beam map of the region was constructed which shows that most of the emission is confined to the central regions of the nebula. These observations may be compared with reported measurement of the 3P1 to 3P2 (63.2 micron) transition in Orion and are consistent with optically thin emission in the 145.5 micron line and self-adsorbed 63.2 micron emission lines. Mechanisms are discussed for the excitation of neutral oxygen. It is included that much of the observed emission originates in the thin, radio-recombination-line-emitting CII/HI envelope bordering on the HII region.
Harwit Martin
Kurtz Nathan T.
Smyers S. D.
Stacey Gordon J.
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