Observations of the 145. 5 micron (O I) emission line in the Orion Nebula
Journal Article
·
· Astrophys. J., Lett. Ed.; (United States)
We have obtained a first set of observations of the (O I) /sup 3/P/sub 0/ -/sup 3/P/sub 1/ (145.5 ..mu..m) transition. We observed the line both in a 1' x 1' beam centered on the Trapezium and in a 7' x 7' beam encompassing most of the Orion Nebula. We also have constructed a wide-beam (7' x 7') map of the region 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 /sup 3/P/sub 1/-/sup 3/P/sub 2/ (63.2 ..mu..m) transition in Orion and are consistent with optically thin emission in the 145.5 ..mu..m line and self-absorbed 63.2 ..mu..m emission lines. We discuss mechanisms for the excitation of neutral oxygen and conclude that much of the observed emission originates in the thin, radio recombination line-emitting C II/H I envelope bordering on the H II region.
- Research Organization:
- Center for Radiophysics and Space Research, Cornell University
- OSTI ID:
- 6239767
- Journal Information:
- Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 265:1; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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