Molecular Hydrogen Fluorescence in the Eridanus Superbubble

The first far-ultraviolet (1350-1750 AA) spectral imaging observations of the Eridanus superbubble, obtained with the SPEAR/FIMS mission, have revealed distinct fluorescent emission from molecular hydrogen. Here we compare the observed emission features with those from a photodissociation region mod...

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Bibliographic Details
Published in:The Astrophysical journal 2006-06, Vol.644 (2), p.L185-L188
Main Authors: Ryu, K, Min, K.-W, Park, J.-W, Lee, D.-H, Han, W, Nam, U.-W, Park, J.-H, Edelstein, J, Korpela, E. J, Nishikida, K, van Dishoeck, E. F
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
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Summary:The first far-ultraviolet (1350-1750 AA) spectral imaging observations of the Eridanus superbubble, obtained with the SPEAR/FIMS mission, have revealed distinct fluorescent emission from molecular hydrogen. Here we compare the observed emission features with those from a photodissociation region model with assumed illuminating stellar fields. The result shows rather high line ratios I sub(1580)/I sub(1610), which may imply the existence of high-temperature molecular clouds in the region. The H sub(2) fluorescence intensity shows a proportional correlation with Ha emission, indicating that the fluorescence and the recombination emission have similar physical origins.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1086/505203