Fluorescent Molecular Hydrogen in the Extragalactic Giant H II Region NGC 5461

Details Fluorescent Molecular Hydrogen in the Extragalactic Giant H II Region NGC 5461 Fluorescent Molecular Hydrogen in the Extragalactic Giant H II Region NGC 5461

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...529..224p&link_type=abstract

The Astrophysical Journal, Volume 529, Issue 1, pp. 224-228.

Astronomy and Astrophysics

Astronomy

8

Atomic Processes, Galaxies: Individual (M101), Ism: H Ii Regions, Infrared: Ism: Lines And Bands, Ism: Individual (Ngc 5461)

Scientific paper

We present a sensitive 2 μm spectrum of the extragalactic giant H II complex NGC 5461. The spectrum contains detections of vibrationally excited molecular hydrogen transitions from energy levels to 19000 K. Comparison of the line emission with models of excitation in photon-dominated regions demonstrates unambiguously that the gas is excited by the UV light from the newly formed stars. We derive an abundance ratio of ortho-to-para states in the excited gas of 1.15+/-0.11, which is among the lowest ever recorded.

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