Physical Conditions in Low-Ionization Regions of the Orion Nebula
Open Access
- 10 September 1996
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 468 (2) , L115-L118
- https://doi.org/10.1086/310245
Abstract
We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new observations show that previous detections of [O I] 5577 were dominated by telluric emission. Our limits are consistent with a moderate density (≈ 104 cm-3) photoionized gas. We show that a previously proposed model of the Orion H II region reproduces the observed [O I] and [Fe II] spectrum. These lines are fully consistent with formation in a dusty region of moderate density.Keywords
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