C II 158 Micron and O i 63 Micron Observations of NGC 7023: A Model for Its Photodisscoiation Region
Abstract
The authors have observed emission in the far infrared fine-structure lines of O I (63 μm) and C II (158 μm) from the bright optical reflection nebula NGC 7023. They interpret this emission as arising in a warm, atomic photodissociation region produced by the interaction of the ultraviolet radiation of the illuminating star with a molecular cloud. The far-infrared line observations are combined with 12CO and 13CO observations to estimate the density and the temperature in the photodissociation region and in the adjacent molecular cloud and to construct a detailed model for the photodissociation region in NGC 7023.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1988
- DOI:
- 10.1086/166878
- Bibcode:
- 1988ApJ...334..803C
- Keywords:
-
- Carbon Isotopes;
- Infrared Spectra;
- Molecular Clouds;
- Photoionization;
- Reflection Nebulae;
- Carbon Monoxide;
- Far Infrared Radiation;
- Fine Structure;
- Interstellar Gas;
- Astrophysics;
- INFRARED: SPECTRA;
- INTERSTELLAR: MOLECULES;
- NEBULAE: INDIVIDUAL NGC NUMBER: NGC 7023;
- NEBULAE: REFLECTION