Abstract
view Abstract Citations (10) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Recombination lines from the interface between the Orion molecular cloud and the H II region NGC 1977. Kutner, M. L. ; Guélin, M. ; Evans, N. J., II ; Tucker, K. D. ; Miller, S. C. Abstract We report observations of the Cl l0a and Hl 10a lines at 6 cm wavelength and the C76a line at 2 cm wavelength from the vicinity of the H II region NOC 1977. The favorable viewing angle in this source allows a direct study of the transition from the H II region to the molecular cloud to be made. The observations confirm that the carbon lines arise from a distinct boundary region at the edge of the molecular cloud. The C + emission zone penetrates about 0.3 pc into the molecular cloud and has a derived electron density of about 1 . It appears that the shock front preceding the expanding ionization front may be responsible for an extended heated region just inside the molecular cloud. Subject headings: interstellar: molecules - nebulae: individual - nebulae: Orion Nebula - radio sources: lines Publication: The Astrophysical Journal Pub Date: January 1979 DOI: 10.1086/156710 Bibcode: 1979ApJ...227..121K Keywords: Gas-Gas Interactions; H Ii Regions; Interstellar Matter; Line Spectra; Recombination Reactions; Carbon; Gas Ionization; Hydrogen Ions; Orion Constellation; Radio Astronomy; Stellar Evolution; Astrophysics; Molecular Clouds:Recombination Lines; Molecular Clouds:Shock Waves full text sources ADS |
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