Observational approach to molecular cloud evolution

Tomoharu Oka, Satoshi Yamamoto

Research output: Contribution to journalArticlepeer-review


We have constructed a 1.2-m submillimeter-wave telescope at the summit of Mt. Fuji to observe molecular clouds in two CI lines, 3 P 1 - 3 P 0 (492 GHz) and 3 P 2 - 3 P 1 (809 GHz). The telescope has been operated successfully for four observing seasons since the installation on 1998. We have obtained large-scale CI 492 GHz distributions of many molecular clouds, including Orion MC, Taurus MC, DR15, ρ-Oph, DR21, NGC2264, M17, W3, W44, W51, Rosette MC, covering more than 40 square degrees of the sky. The distribution of CI 492 GHz emission is found to be different from those of the 13 CO or C 18 O emission in some clouds. We found C 0 -rich areas (C/CO ∼ 1) in several dark clouds without strong UV sources. Away from UV sources the spatial sequence appears to be C + /CO/C 0 . This seems to be inconsistent with the standard photodissociation region picture. These results are discussed in relation to formation processes of molecular clouds and dense cloud cores.

Original languageEnglish
Pages (from-to)519-523
Number of pages5
JournalAdvances in Space Research
Issue number3
Publication statusPublished - 2004 Jan 1
Externally publishedYes


  • Molecular cloud evolution
  • Submillimeter CI lines
  • Submillimeter wave telescope

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)


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