| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 2, August 1999
|
|
|---|---|---|
| Page(s) | 187 - 202 | |
| DOI | https://doi.org/10.1051/aas:1999271 | |
| Published online | 15 August 1999 | |
Galactic anticenter CO survey
I. Area 
to
, 
to 
Korea Astronomy Observatory, Taeduk Radio Astronomy Observatory, San 36-1 Hwaam-dong, Yusung-gu, Taejon 305-348, Korea e-mail: yulee@hae.issa.re.kr
Send offprint request to: Y. Lee, visiting scientist at Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-78, Cambridge, MA 02138, U.S.A.
Received:
2
July
1998
Accepted:
9
April
1999
We have mapped a 17 square-degree section (
) =
(
) of
the Galactic Anticenter region in the 12CO 
line using the
3-mm SIS receiver on the 14-m telescope at the Taeduk Radio Astronomy
Observatory. A total of 7 000 spectra has been obtained with a grid
spacing of 
. The results of the observations are presented in the
form of 
and 
contour maps. Molecular emission of
the mapped area is found to be very extended and matches with the FIR
emission boundary.
The radial velocity of the molecular gas is found to be within the
range of 
+10 km s-1. We also found several
small clouds located at 
, 
having 
km s-1, which is quite anomalous
in this direction. We identified 30 individual clouds within the mapped
region with an arbitrary threshold temperature using a cloud
identification code. Twelve subclouds were also identified
from the largest cloud with a higher threshold temperature. The ratio
of dust emission to CO integrated intensity for the Galactic
Anticenter region is found to be similar to that of the dark clouds
in solar neighborhood, and much less than that of giant molecular
clouds, implying that the heating source within the clouds is minimal.
Key words: ISM: clouds / ISM: abundance / ISM: dust / ISM: Hii regions
© European Southern Observatory (ESO), 1999