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 journalArticle

42 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 ( ≡ 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.

Original languageEnglish
Pages (from-to)125-131
Number of pages7
JournalAstrophysical Journal, Supplement Series
Volume100
Issue number1
Publication statusPublished - 1995 Sep
Externally publishedYes

Fingerprint

gas
galaxies
Columbia (Orbiter)
solar neighborhood
quadrants
molecular gases
spiral galaxies
angular resolution
molecular clouds
gases
distribution

Keywords

  • Galaxy: structure
  • ISM: molecules
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

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.

An out-of-plane CO (J = 2-1) survey of the milky way. I. The data. / Sakamoto, Seiichi; Hasegawa, Tetsuo; Hayashi, Masahiko; Handa, Toshihiro; Oka, Tomoharu.

In: Astrophysical Journal, Supplement Series, Vol. 100, No. 1, 09.1995, p. 125-131.

Research output: Contribution to journalArticle

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, vol. 100, no. 1, pp. 125-131.
Sakamoto, Seiichi ; Hasegawa, Tetsuo ; Hayashi, Masahiko ; Handa, Toshihiro ; Oka, Tomoharu. / An out-of-plane CO (J = 2-1) survey of the milky way. I. The data. In: Astrophysical Journal, Supplement Series. 1995 ; Vol. 100, No. 1. pp. 125-131.
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