Discovery of radiatively excited molecular hydrogen in the giant extragalactic HII region complex NGC 604

Details Discovery of radiatively excited molecular hydrogen in the giant extragalactic HII region complex NGC 604 Discovery of radiatively excited molecular hydrogen in the giant extragalactic HII region complex NGC 604

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.236...89i&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 236, Jan. 1, 1989, p. 89-95.

Astronomy and Astrophysics

Astronomy

8

H Ii Regions, Hydrogen, Molecular Excitation, Nebulae, Line Spectra, Ultraviolet Radiation

Scientific paper

The 1-0S(1), 2-1S(1), 1-0S(0) and 1-0Q branch transitions of molecular hydrogen (H2) towards the giant emission nebula (HII region) NGC 604 in M33 have been detected. The line ratios are incompatible with shock-excited H2, but indicate the widespread presence of fluorescent H2 at a mean temperature T = 70 + or - 15 K. This is the first detection of fluorescent H2 emission associated with a giant (extragalactic) HII region complex.

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