The molecular hydrogen content of NGC 604 and other M33 H II region complexes

Details The molecular hydrogen content of NGC 604 and other M33 H II region complexes The molecular hydrogen content of NGC 604 and other M33 H II region complexes

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..471i&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 1, 1990, p. 471-477.

Astronomy and Astrophysics

Astronomy

12

H Ii Regions, Local Group (Astronomy), Molecular Clouds, Molecular Gases, Spiral Galaxies, Carbon Monoxide, Early Stars, Interstellar Extinction, Stellar Luminosity, Stellar Winds

Scientific paper

Six bright H II regions in M33 have been searched for H2 line emission. Previously detected fluorescent H2 emission in the first-ranked M33 H II region, NGC 604, has been mapped, making it possible to estimate the mass of its molecular cloud (of order 3 x 10 to the 6th solar masses). This result implies a ratio I(CO)/N(H2) lower by an order of magnitude than that of galactic molecular clouds. The lack of shocked H2 in NGC 604 implies that the ionized stellar-wind bubbles seen in the nebula are not interacting strongly with the molecular material. The dynamics of NGC 604 appear to be dominated by gravitational interaction.

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