Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..220h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 220-231. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
36
Carbon Monoxide, Far Infrared Radiation, H Ii Regions, Infrared Astronomy, Molecular Clouds, Radio Sources (Astronomy), Astronomical Spectroscopy, Cosmic Dust, Emission Spectra, Infrared Astronomy Satellite, Spatial Distribution, Star Formation
Scientific paper
The molecular cloud associated with compact radio and bright optical H II regions is studied from observations of (C-12)O, (C-13)O, HCN J = 1-0 emission. The far-infrared and millimeter molecular line emission from the S254-S258 molecular cloud is analyzed, using co-added survey data from IRAS, to investigate the coupling between the dust and gas components and the internal energetics associated with molecular clouds. The dust component is analyzed by fitting model intensities, derived from a dust mass column density temperature relation, to the observed far-infrared emission. Such modeling is shown to provide a more complete description of the cold dust component which comprises most of the dust mass than can be determined from the standard single temperature analysis. Local heating of the dust component by newborn massive stars associated with the H II regions of the cloud is inferred from the spatial distribution of temperatures of grains which make the largest contributions to the observed 60 and 100 micron emission.
Heyer Mark H.
Morgan James
Schloerb Peter F.
Snell Ronald L.
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