Abstract
view Abstract Citations (337) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Dense cores in dark clouds. I. CO observations and column densities of high-extinction regions. Myers, P. C. ; Linke, R. A. ; Benson, P. J. Abstract Ninety small (approximately 5 arcmin) visually opaque regions selected for Palomar Sky Atlas prints are surveyed in the 2.7 mm J = 1 - 0 lines of C(O-18) and (C-13)O. The regions are for the most part in complexes of obscuration, including those in Taurus and Ophiuchus. The typical C(O-18) emission region has a C(O-18) line width of 0.6 km/s, an optical depth of 0.4, an excitation temperature of 10 K, and a column density of 2 x 10 to the 15th per sq cm. It has a size of 0.3 pc, a visual extinction of approximately 11 mag, and a mass of approximately 30 solar masses. A comparison with equilibrium and collapse models suggests that purely thermal supporting motions are consistent with the present data, although this is considered unlikely. It is pointed out that if the full C(O-18) line width reflects turbulent supporting motions, nearly all of the observed clouds are consistent with stable equilibrium. If only part of the C(O-18) line width reflects supporting motions, a number of clouds are also consistent with turbulent contraction. Publication: The Astrophysical Journal Pub Date: January 1983 DOI: 10.1086/160619 Bibcode: 1983ApJ...264..517M Keywords: Carbon Monoxide; Interstellar Extinction; Interstellar Matter; Molecular Clouds; Nebulae; Spectral Line Width; Astronomical Catalogs; Astronomical Spectroscopy; Emission Spectra; Gauss Equation; Histograms; Line Spectra; Astrophysics full text sources ADS | data products SIMBAD (105) Related Materials (12) Part 2: 1983ApJ...266..309M Part 3: 1983RMxAA...7..238M Part 4: 1983ApJ...270..105M Part 5: 1983ApJ...270..589B Part 6: 1988ApJ...324..907M Part 7: 1991ApJ...376..561M Part 8: 1992ApJ...384..523F Part 9: 1993ApJ...406..528G Part 10: 1994ApJ...433...96V Part 11: 1994ApJ...433..117L Part 12: 1998ApJ...506..743B Part 13: 2000ApJ...532.1038V
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