The Effect of Star Formation on Molecular Clouds in Dwarf Irregular Galaxies: IC 10 and NGC 6822 | Zendy

G. Petitpas | Zendy; C. D. Wilson | Zendy

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The Effect of Star Formation on Molecular Clouds in Dwarf Irregular Galaxies: IC 10 and NGC 6822

Author(s) -

G. Petitpas,

C. D. Wilson

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/305351

Subject(s) - astrophysics , physics , star formation , metallicity , galaxy , mean kinetic temperature , local group , dwarf galaxy , irregular galaxy , line (geometry) , molecular cloud , astronomy , stars , lenticular galaxy , geometry , mathematics

We have observed the 13CO J=2-1, 12CO J=2-1 and 12CO J=3-2 lines at a fewlocations in the dwarf irregular galaxies IC 10 and NGC 6822 using the JamesClerk Maxwell Telescope. In addition, we report the first detection of the 13COJ=3-2 transition in a Local Group galaxy. These low metallicity environmentsappear to be porous to UV radiation and allow for more efficient heating ofmolecular gas by nearby HII regions. The high 12CO J=3-2/J=2-1 ratio in NGC6822 suggests that the 12CO emission is optically thin in this region. Thishigh line ratio is likely the result of its location inside a large HII regionwith low metallicity and low gas content. In IC 10 we observe structures on avariety of size scales that all appear to be gravitationally bound. This effectmay help explain the rather high star formation rate in IC 10.Comment: 20 pages with 6 ps figures, accepted for publication in The Astrophysical Journa

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