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 language | English |
|---|---|
| Pages (from-to) | 125-131 |
| Number of pages | 7 |
| Journal | Astrophysical Journal, Supplement Series |
| Volume | 100 |
| Issue number | 1 |
| Publication status | Published - 1995 Sep |
| Externally published | Yes |
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Keywords
- Galaxy: structure
- ISM: molecules
- Surveys
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
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 journal › Article
}
TY - JOUR
T1 - An out-of-plane CO (J = 2-1) survey of the milky way. I. The data
AU - Sakamoto, Seiichi
AU - Hasegawa, Tetsuo
AU - Hayashi, Masahiko
AU - Handa, Toshihiro
AU - Oka, Tomoharu
PY - 1995/9
Y1 - 1995/9
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.
AB - 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.
KW - Galaxy: structure
KW - ISM: molecules
KW - Surveys
UR - http://www.scopus.com/inward/record.url?scp=0008585517&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0008585517&partnerID=8YFLogxK
M3 - Article
VL - 100
SP - 125
EP - 131
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
SN - 0067-0049
IS - 1
ER -