Level population and para/ortho ratio of fluorescent H2 in NGC 2023

Details Level population and para/ortho ratio of fluorescent H2 in NGC 2023 Level population and para/ortho ratio of fluorescent H2 in NGC 2023

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..77h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 15, 1987, p. L77-L80. SERC-MOESC-supporte

Astronomy and Astrophysics

Astrophysics

74

Fluorescence, Ortho Hydrogen, Para Hydrogen, Reflection Nebulae, Molecular Rotation, Molecular Spectra, Ortho Para Conversion, Vibrational Spectra

Scientific paper

Observations of vibrationally excited H2 in 10 lines at 2.03 - 2.39 μm toward the reflection nebula NGC 2023 are presented and compared with the corresponding data in Orion-KL. Level populations of H2 in NGC 2023 are characterized by a high vibrational temperature (Tv > 3600K) and a low rotational temperature (Tr ≈ 900 - 1500K). This confirms the identification of the H2 emission as due to UV excitation followed by fluorescence. The observed para/ortho ratio of H2 is consistently larger than 1:3 and is estimated to be in the range 1 : (1.4 - 2.0).

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