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One-millimeter continuum emission studies of four molecular clouds
Westbrook, W. E.; Werner, M. W.; Elias, J. H.; Gezari, D. Y.; Hauser, M. G.; Lo, K. Y.; Neugebauer, G.
AA(California Institute of Technology, Pasadena, Calif.), AB(California Institute of Technology, Pasadena, Calif.), AC(California Institute of Technology, Pasadena, Calif.), AD(Hale Observatoires, Pasadena, Calif.), AE(Hale Observatoires, Pasadena, Calif.), AF(Hale Observatoires, Pasadena, Calif.), AG(Owens Valley Radio Observatory, Pasadena, Calif.)
Astrophysical Journal, vol. 209, Oct. 1, 1976, pt. 1, p. 94-101. Research supported by the Research Corp. and NASA (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Maps, Cosmic Dust, Interstellar Gas, Millimeter Waves, Nebulae, Thermal Emission, Density Distribution, H Ii Regions, Hot Stars, Radial Distribution, Radio Sources (Astronomy), Spatial Distribution
Bibliographic Code:


Maps with 1-arcmin resolution are presented of 1-mm thermal emission from dust grains in the central portions of the molecular clouds associated with four H II regions: W3, M42 (OMC-1), Sgr B2, and W49. The maps cover regions approximately 5 by 5 arcmin in extent. In each source, a sharp peak in the 1-mm surface brightness is seen at the position of a compact H II region and/or one or several luminous near-infrared sources. The radial density distributions in the center of the clouds have been estimated from the observed distribution of 1-mm surface brightness near the peaks. The results indicate that the central density gradients are quite steep. These gradients may have been established in the clouds by the collapse processes which led to the formation of the central luminous objects.

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