CO survey of the southern Galaxy

Details CO survey of the southern Galaxy CO survey of the southern Galaxy

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193...60r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 60-68.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Spectroscopy, Carbon Monoxide, Milky Way Galaxy, Molecular Clouds, Emission Spectra, Galactic Rotation, Galactic Structure, Radial Velocity, Terminal Velocity

Scientific paper

A well-sampled survey of J = 1-0 CO emission along the southern galactic plane has been carried out with the 4-m telescope at Epping, NSW. This paper discusses the variation of the terminal velocities of the CO profiles with longitude, and compares the results with southern 1.4 GHz H-line data and northern CO data. Comparisons are also made of the integrated CO emission as a function of longitude; the southern CO data show steps which suggest directions tangential to spiral arms. The mean height above the galactic plane and thickness of the CO layer is given as a function of galactic longitude. In the southern (fourth) galactic quadrant the variation of CO emissivity with galactocentric radius was a broad peak (0.25 < R/R0 < 0.80), much wider than the "ring" of CO observed in the northern (first) quadrant. The integrated CO emissivity for 0.2 ≤ R/R0 ≤ 1 is 33% larger in the south.

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