The CO distribution around L = 30 deg, B = 0 deg

Details The CO distribution around L = 30 deg, B = 0 deg The CO distribution around L = 30 deg, B = 0 deg

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235...45s&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 45-51.

Astronomy and Astrophysics

Astrophysics

5

Abundance, Carbon Monoxide, Galactic Structure, Interstellar Gas, Molecular Gases, Line Spectra, Milky Way Galaxy, Particle Size Distribution, Telescopes

Scientific paper

The 4.6-m millimeter-wave telescope at the University of British Columbia has been used to map a region about 0.5 deg in diameter centered on l = 30 deg, b = 0 deg in the J = 1 to 0 transition of (C-12)(O-16). This study of the inner edge of the galactic molecular ring has revealed two well-defined giant molecular clouds with diameters in the range 25-45 pc and masses in the range 150,000 to 350,000 solar masses. Values obtained for the internal kinetic and potential energies of these clouds are similar, indicating that they may be stable. In addition, the analysis indicates that a substantial fraction, amounting to approximately 30%, of the integrated CO intensity comes from a feature covering the entire field observed. This suggests that at the inner edge of the molecular ring there is a clumpy medium of molecular material with a smoothed average density equal to 4/cu cm. A complex of four clouds whose line widths are a little more than a factor of two greater than those of the standard giant molecular clouds has also been found. The total number of clouds detected in the survey, 10, gives a number density of CO clouds of 3 x 10 to the -7th/cu pc.

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