期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 141, 期 1, 页码 157-185出版社
UNIV CHICAGO PRESS
DOI: 10.1086/340038
关键词
ISM : jets and outflows; radio lines : ISM; stars : formation
We conducted a large-scale survey for the cold infrared sources along the northern Galactic plane in the CO (J = 1-0) line. There are 1912 IRAS sources selected on the basis of their color indices over the 12, 25, and 60 l m wave bands and their association with regions of recent star formation. A quick single-point survey was made toward all of the sources, which results in a detection of 1331 sources with significant CO emission above the detection limit of 0.7 K, inferring a CO detection rate of 70%. Located over a wide range of the Galactocentric distances, the CO sources show high concentration toward the spiral arms. Among the detected sources, there are 351 sources found to have high-velocity CO wing emission. A search for the latest catalog of high-velocity CO flows (HVFs) from young stellar objects indicates that 289 sources are beyond the present lists of HVFs. These high-velocity wing sources provide us with a comprehensive database for the study of HVFs from young stellar objects. Using the known outflow sources as an effective indicator, we found that the detection rate for high-velocity wings during the quick survey is 62%, moderately sensitive in searching for new outflow sources. The CO detection rate of the IRAS sources, combined with the ratio of high-velocity wing, suggests that 41% of the CO sources are undergoing the HVF phase. In this paper, the CO spectra are presented along with the preliminary statistics of the data.
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