Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..115e&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Feb. 15, 1981, p. 115-123. Research supported by the Fannie and John Hertz Foundation;
Astronomy and Astrophysics
Astronomy
83
Carbon Monoxide, Far Infrared Radiation, Infrared Astronomy, Interstellar Gas, Molecular Clouds, Astronomical Maps, Gas Heating, H Ii Regions, Molecular Collisions, Radiant Flux Density
Scientific paper
The molecular cloud accompanying the Cepheus OB3 association is observed in the infrared at wavelengths of 10-400 microns. Far-infrared emission at 55 microns and 125 microns from the two CO hot spots, Cep A and Cep B, is mapped with a resolution of approximately one arcmin. Cep A is also mapped at 400 microns with a resolution of approximately one arcmin, and both hot spots are searched for 20-micron sources. It is noted that the Cep A hot spot appears to be heated by energy sources internal to the molecular cloud. The dust temperatures are considered sufficient to explain the gas temperatures provided the dust heats the gas by collisions. In marked contrast, the Cep B region appears to be heated from outside the cloud, with the strongest far-infrared emission arising near the interface between the molecular cloud and the S155 H II region. It is thought that the gas heating rate through collisions with dust may be insufficient to achieve the gas temperature observed in Cep B.
Becklin Eric E.
Beichman Ch.
Evans Neal J. II
Gatley Ian
Hildebrand Roger H.
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