Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..777m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 2, p. 777-783
Astronomy and Astrophysics
Astrophysics
45
Emission Spectra, Hydrogen Clouds, Infrared Spectroscopy, Molecular Excitation, Seyfert Galaxies, Starburst Galaxies, Thermal Emission, Thermal Radiation, Astronomical Spectroscopy, H Ii Regions, Photodissociation, Shock Fronts, Supernova Remnants, Supernovae
Scientific paper
Infrared H2 emission is a mixture of thermal and nonthermal components. We have found the excitation temperature of the thermal component to be 2000 K for supernova remnants and less than or equal to 1000 K for photodissociation regions. Hence the thermal H2 temperature is a discriminant between shock excitation by supernovae and UV excitation by OB stars. Utilizing this result, we discuss the origin of H2 emission in Seyfert and starburst galaxies, which has long been controversial.
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