Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..409e&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 409-415.
Astronomy and Astrophysics
Astronomy
29
Gas Heating, Infrared Astronomy, Interstellar Gas, Molecular Clouds, Carbon Isotopes, Carbon Monoxide, Cosmic Dust, Far Infrared Radiation, H Ii Regions, Heat Sources, Interstellar Masers, Luminosity, Near Infrared Radiation, Optical Thickness, Spectral Energy Distribution, Stellar Evolution, Water Masers
Scientific paper
Infrared observations from 7.8 to 200 microns have been obtained for the S235 molecular cloud. Far-infrared maps were obtained for a region of active star formation, as marked by the presence of compact H II regions, water masers, and compact near-infrared sources. The primary heating source for the far-infrared emission appears to be the compact H II region, S235A. Detailed examination of the gas energetics in the region supports the plausibility of the picture in which the gas is heated by collisions with warm dust grains. The ratio of far-infrared optical depth to (C-13)O column density is somewhat lower in this source than is commonly found. This effect may be caused by the presence of substantial (C-13)O in regions where the dust is not warm enough to emit substantial 50-100 micron radiation.
Beichman Ch.
Evans Neal J. II
Gatley Ian
Harvey Paul
Nadeau Daniel
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