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BOK globules and small molecular clouds - Deep IRAS photometry and (C-12)O spectroscopy
Clemens, Dan P.; Yun, Joao Lin; Heyer, Mark H.
AA(Boston University, MA), AB(Boston University, MA), AC(Pennsylvania, University, Philadelphia; Carnegie Institution of Washington, Washington, DC)
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, March 1991, p. 877-904. Research supported by Boston University. (ApJS Homepage)
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NASA/STI Keywords:
Astronomical Photometry, Astronomical Spectroscopy, Carbon Monoxide, Infrared Astronomy Satellite, Molecular Clouds, Infrared Imagery, Infrared Photometry, Infrared Sources (Astronomy), Infrared Spectra
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The entire sample of small molecular clouds cataloged by Clemens and Barvainis (1988) has been probed using deep, coadded IRAS survey data analysis and (C-12)O spectroscopy. The far-IR colors are similar to those found for other amorphous Galactic constituents. The mean 12.25 micron color was 0.01, the mean 25/60 micron color was 0.68, and the mean 60/100 micron color was 0.70. The bulk of the dust mass was colder than 30 K. A very strong anticorrelation was found between dust optical depth and 60/100 micron color temperature. The mean far-IR luminosity of the sample is about 6.4 solar luminosities, the mean cloud mass is about 11 solar, the radius is around 0.35 pc, and the density is around 1000 H2/cu cm. Upper and lower limits for the number of these clouds in the Galaxy are 160,000 and 650,000. A total Galactic mass in Bok globules of about 3.5 million solar and a total luminosity of about two million solar is found.

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