An Out‐of‐Plane CO (J= 2–1) Survey of the Milky Way. II. Physical Conditions of Molecular Gas

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Abstract

Physical conditions of molecular gas in the first quadrant of the Galaxy are examined through comparison of the CO J = 2-1 data of the Tokyo-Nobeyama Radio Observatory survey with the CO J = 1-0 data of the Columbia survey. A gradient of the CO J = 2-1/J = 1-0 intensity ratio (≡ R2-1/1-0) with Galactocentric distance is reported. The ratio varies from ≃0.75 at 4 kpc to ≃0.6 at 8 kpc in Galactocentric distance. This confirms the early in-plane results reported by Handa et al.

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