CO observations, geometry, and galactic structure

Details CO observations, geometry, and galactic structure CO observations, geometry, and galactic structure

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.119..111r&link_type=abstract

(IAU, Asian-Pacific Regional Meeting, 3rd, Kyoto, Japan, Sept. 30-Oct. 5, 1984) Astrophysics and Space Science (ISSN 0004-640X),

Astronomy and Astrophysics

Astrophysics

1

Carbon Monoxide, Galactic Structure, Hydrogen Clouds, Molecular Clouds, Stellar Evolution, Circular Orbits, H Lines, Interstellar Gas

Scientific paper

2.6 mm carbon monoxide and 21 cm hydrogen line observations of the Galaxy define six directions where gas is seen tangentially along a spiral feature and four directions where extended structures cross the R = R0 circle. These directions provide a geometrical framework for any spiral structure pattern. Also simple equations are derived to define the normalized radius R/R0 of gas with a particular radial velocity in terms of the observed tangential velocity of gas with the same R/R0 = sin lT, without specific knowledge of ω(R), ω0 or R0.

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