HUT, FUSE, and Rocket Observations of IC 63: Molecular Hydrogen Fluorescence

Details HUT, FUSE, and Rocket Observations of IC 63: Molecular Hydrogen Fluorescence HUT, FUSE, and Rocket Observations of IC 63: Molecular Hydrogen Fluorescence

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.5909f&link_type=abstract

American Astronomical Society Meeting 205, #59.09; Bulletin of the American Astronomical Society, Vol. 36, p.1440

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We present far-ultraviolet spectroscopy of the photodissociation region IC 63. These observations mark the first time that the entire electronic transition band of H2 has been studied as a whole and the first look at the resolved rotational structure of molecular hydrogen below 1200 A in IC 63. Models of molecular hydrogen fluorescence in IC 63 have overpredicted the absolute flux at short wavelengths by as much as an order of magnitude. We present a fluorescence model that resolves the discrepancies between mid and far-ultraviolet emission by employing two temperature components, self-absorption out of the ground vibrational level of H2, and a flux calibrated input spectrum of the exciting source, gamma-Cas (HD 5394). A scattered light spectrum of gamma-Cas obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE) at an angular separation of 1' has been flux calibrated using the results of a recent sounding rocket flight to observe gamma-Cas with a far-ultraviolet sensitive CCD. The spectrum of IC 63 acquired with the Hopkins Ultraviolet Telescope allows us to test this model with spectral coverage across the entire 900-1650 A window spanned by fluorescent H2 emission. This model can be tested in finer detail by a comparison with high-resolution spectra of IC 63 from FUSE. Our model finds relatively good agreement with the observed emission line strengths seen in the spectra.

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