An out-of-plane CO (J = 2-1) survey of the milky way. I. The data

Seiichi Sakamoto; Tetsuo Hasegawa; Masahiko Hayashi; Toshihiro Handa; Tomoharu Oka

doi:10.1086/192210

An out-of-plane CO (J = 2-1) survey of the milky way. I. The data

Seiichi Sakamoto, Tetsuo Hasegawa, Masahiko Hayashi, Toshihiro Handa, Tomoharu Oka

Research output: Contribution to journal › Review article

44 Citations (Scopus)

Abstract

We present extensive CO (J = 2-1) survey data of the first quadrant of the Galaxy taken with the same angular resolution as the Columbia CO (J = 1-0) survey. The CO (J = 2-1) data were compared with the CO (J = 1-0) data of Cohen Dame, & Thaddeus. The distribution of CO (J = 2-1) emission mimics that of CO (J = 1-0) emission with the CO (J = 2-1)/CO (J = 1-0) intensity ratio ( ≡ R_2-1/1-0) of 0.66 averaged over the observed area This value is typical of nearby giant molecular clouds and of gas disks of spiral galaxies and is consistent with the CO emission arising from subthermally excited, optically thick gas. Molecular gas in the inner part of the Galaxy tends to exhibit a higher value of R_2-1/1-0 than in the solar neighborhood.

Original language	English
Pages (from-to)	125-131
Number of pages	7
Journal	Astrophysical Journal, Supplement Series
Volume	100
Issue number	1
DOIs	https://doi.org/10.1086/192210
Publication status	Published - 1995 Sep
Externally published	Yes

Keywords

Galaxy: structure
ISM: molecules
Surveys

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Sakamoto, S., Hasegawa, T., Hayashi, M., Handa, T., & Oka, T. (1995). An out-of-plane CO (J = 2-1) survey of the milky way. I. The data. Astrophysical Journal, Supplement Series, 100(1), 125-131. https://doi.org/10.1086/192210

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AU - Hayashi, Masahiko

AU - Handa, Toshihiro

AU - Oka, Tomoharu

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N2 - We present extensive CO (J = 2-1) survey data of the first quadrant of the Galaxy taken with the same angular resolution as the Columbia CO (J = 1-0) survey. The CO (J = 2-1) data were compared with the CO (J = 1-0) data of Cohen Dame, & Thaddeus. The distribution of CO (J = 2-1) emission mimics that of CO (J = 1-0) emission with the CO (J = 2-1)/CO (J = 1-0) intensity ratio ( ≡ R2-1/1-0) of 0.66 averaged over the observed area This value is typical of nearby giant molecular clouds and of gas disks of spiral galaxies and is consistent with the CO emission arising from subthermally excited, optically thick gas. Molecular gas in the inner part of the Galaxy tends to exhibit a higher value of R2-1/1-0 than in the solar neighborhood.

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