A SURVEY OF MOLECULAR LINES TOWARD MASSIVE CLUMPS IN EARLY EVOLUTIONARY STAGES OF HIGH-MASS STAR FORMATION

@inproceedings{Sakai2010ASO,
  title={A SURVEY OF MOLECULAR LINES TOWARD MASSIVE CLUMPS IN EARLY EVOLUTIONARY STAGES OF HIGH-MASS STAR FORMATION},
  author={Takeshi Sakai and Nami Sakai and Tomoya Hirota and Satoshi Ibaraki-shi Yamamoto},
  year={2010}
}
We have observed the CH3OH J = 2–1, SiO J = 2–1, C 34 S J = 2–1, H 13 CO + J = 1–0, HN 13 C J = 1–0, CCH N = 1–0, OCS J = 8–7, and SO JN = 22–11 lines toward 20 massive clumps, including Midcourse Space Experiment (MSX )8 μm dark sources (infrared dark clouds) andMSX 8 μm sources, by using the Nobeyama Radio Observatory 45 m telescope. We have found that the velocity widths of the CH3OH and C 34 S lines are broader than those of the H 13 CO + line in the MSX dark sources. On the other hand… CONTINUE READING