Atomic carbon and CO isotope emission in the vicinity of DR 15

Tomoharu Oka, Satoshi Yamamoto, Mitsuhiro Iwata, Hiroyuki Maezawa, Masafumi Ikeda, Tetsuya Ito, Kazuhisa Kamegai, Takeshi Sakai, Yutaro Sekimoto, Ken'ichi Tatematsu, Yuji Arikawa, Yoshiyuki Aso, Takashi Noguchi, Sheng Cai Shi, Keisuke Miyazawa, Shuji Saito, Hiroyuki Ozeki, Hideo Fujiwara, Masatoshi Ohishi, Junji Inatani

研究成果: Article査読

34 被引用数 (Scopus)

抄録

We present observations of the 3P1-3P0 fine-structure transition of atomic carbon [C I], the J = 3-2 transition of CO, and the J = 1-0 transitions of 13CO and C18O toward DR 15, an H 11 region associated with two mid-infrared dark clouds (IRDCs). The 13CO and C18O J = 1-0 emissions closely follow the dark patches seen in optical wavelength, showing two self-gravitating molecular cores with masses of 2000 and 900 M, respectively, at the positions of the cataloged IRDCs. Our data show a rough spatial correlation between [C I] and 13CO J = 1-0. Bright [C I] emission occurs in the relatively cold gas behind the molecular cores but does not occur in either highly excited gas traced by CO J = 3-2 emission or in the H II region/molecular cloud interface. These results are inconsistent with those predicted by standard photodissociation region models, suggesting an origin for interstellar atomic carbon unrelated to photodissociation processes.

本文言語English
ページ(範囲)176-184
ページ数9
ジャーナルAstrophysical Journal
558
1 PART 1
DOI
出版ステータスPublished - 2001 9月 1
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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