Detection of molecular hydrogen emission from G 333.6-0.2

Astronomy and Astrophysics – Astronomy

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Emission Spectra, Infrared Spectra, Molecular Clouds, H Ii Regions, Helium, Line Spectra, Spatial Distribution, Spectrophotometry, Vibrational Spectra

Scientific paper

Emission from the S(1) (υ = 1→0; J = 3→1) rotation-vibration transition of H2 at 2.1218 μm has been detected from the H II region G 333.6-0.2. This detection has been confirmed by observations of the unresolved Q-branch lines of H2 at 2.4 μm. The H2 emission is very widespread, extending ±60 arcsec in RA and at least ±4o arcsec in Dec. If this emission comes from material close to the ionized hydrogen emission region, the total luminosity in all the H2 lines after correcting for extinction is ≈260 L_sun;. The spatial distribution and energetics of the H2 emission are consistent with the emitting region being a thin sheet at the interface between the molecular cloud and the ionized blister.

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