The distribution of atomic carbon in the Orion giant molecular cloud 1

Masafumi Ikeda, Tomoharu Oka, Ken'ichi Tatematsu, Yutaro Sekimoto, Satoshi Yamamoto

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


The large-scale distribution of the C I (3P1- 3P0, 492 GHz) emission line from Orion A and B giant molecular clouds has been imaged with the Mount Fuji submillimeter-wave telescope. The total area observed is about 15 deg2. The overall spatial and velocity structure of the C I line is found to be similar to that of the 13CO (J = 1-0) line. The derived column density ratio N(C I)/N(CO) shows a large variation ranging from 0.2 to 2.9 toward the cloud edges, whereas it is relatively constant between 0.1 and 0.2 toward the interior region of the entire Orion clouds in both massive star-forming and dark cloud regions. This almost constant ratio suggests that C I can coexist with CO even in the deep inside of the molecular cloud.

Original languageEnglish
Pages (from-to)467-485
Number of pages19
JournalAstrophysical Journal, Supplement Series
Issue number2
Publication statusPublished - 2002 Apr 1
Externally publishedYes


  • ISM: atoms
  • ISM: clouds
  • ISM: individual (Orion A Cloud, Orion B)
  • ISM: molecules
  • Submillimeter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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