Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9984011s&link_type=abstract
Nobeyama Radio Observatory Report, p. 1
Physics
Surveys, Galactic Structure, Gas Density, Interstellar Gas, Molecular Gases, Angular Resolution, Circles (Geometry), Extraction, Gradients, Gravitational Collapse, Nonlinearity, Sagittarius Constellation, Scutum Constellation
Scientific paper
We conducted an extensive CO J = 2 - 1 survey of the northern Galactic plane with the same angular resolution as the CfA CO J = 1 - 0 survey to extract physical conditions of the molecular gas. The CO j = 2 - 1/J = 1 - 0 intensity ratio (==R2-1/1-0 shows a large-scale radial gradient from approx. equal 0.70 at 4 kpc to 0.55 at 8 kpc in Galactocentric distance. The observed large-scale radial decrease in R2-1/1-0 is ascribed to the fractional decrease of molecular gas with higher R2-1/1-0, or dense gas, from approx. equal 40% near 5 kpc to approx. equal 20% near the solar circle. Molecular gas with higher R2-1/1-0 is found predominantly along the Sagittarius and Scutum arms, probably in their downstream. This implies that the physical conditions of the interstellar gas, in particular density, are affected by grand-design, nonlinear processes, such as gravitational collapse induced by spiral density waves.
Hasegawa Tetsuo
Hayashi Masahiko
Morino Jun'ichi
Oka Tomoharu
Sakamoto Seiichi
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