An infrared study of the NGC 1977 H II region/molecular cloud interface

Details An infrared study of the NGC 1977 H II region/molecular cloud interface An infrared study of the NGC 1977 H II region/molecular cloud interface

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..341m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 341-350.

Astronomy and Astrophysics

Astrophysics

32

H Ii Regions, Interstellar Matter, Molecular Clouds, Nebulae, Far Infrared Radiation, Gas Ionization, Infrared Photometry, Molecular Spectra, Near Infrared Radiation

Scientific paper

The results of an infrared study of the H II region NGC 1977 and the adjacent dense molecular cloud are reported. Extensive far-infrared maps with 45 arcsec resolution allow the spatial structure of the dust temperature and optical depth variations across the ionization front to be delineated. Analysis of the dust energetics indicates that the only significant energy source is the B1 V star HD 37018 which ionizes the H II region. This result, together with a favorable geometry, provides a good opportunity to determine the ratio of ultraviolet absorption efficiency to far-infrared emission efficiency, 790 + 460 or - 180. Analysis of the gas energetics indicates that collisions with warm dust grains can explain the observed gas temperatures.

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