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• W2090574171 abstract "We present far-ultraviolet spectroscopy of the emission/reflection nebula IC 405 obtained by a rocket-borne long-slit spectrograph and the Far Ultraviolet Spectroscopic Explorer (FUSE). Both data sets show a rise in the ratio of the nebular surface brightness to stellar flux (S/F*) of approximately 2 orders of magnitude toward the blue end of the far-UV bandpass. Scattering models using simple dust geometries fail to reproduce the observed S/F* for realistic grain properties. The high spectral resolution of the FUSE data reveals a rich fluorescent molecular hydrogen spectrum ≈1000'' north of the star that is clearly distinguished from the steady blue continuum. The S/F* remains roughly constant at all nebular pointings, showing that fluorescent molecular hydrogen is not the dominant cause of the blue rise. We discuss three possible mechanisms for the blue dust: differential extinction of the dominant star (HD 34078), unusual dust-grain properties, and emission from nebular dust. We conclude that uncertainties in the nebular geometry and the degree of dust clumping are most likely responsible for the blue rise. As an interesting consequence of this result, we consider how IC 405 would appear in a spatially unresolved observation. If IC 405 were observed with a spatial resolution of less than 0.4 pc, for example, an observer would infer a far-UV flux that was 2.5 times the true value, giving the appearance of a stellar continuum that was less extinguished than radiation from the surrounding nebula, an effect that is reminiscent of the observed ultraviolet properties of starburst galaxies." @default.
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• W2090574171 date "2004-11-20" @default.
• W2090574171 modified "2023-10-01" @default.
• W2090574171 title "Rocket and<i>Far Ultraviolet Spectroscopic Explorer</i>Observations of IC 405: Differential Extinction and Fluorescent Molecular Hydrogen" @default.
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• W2090574171 doi "https://doi.org/10.1086/424813" @default.
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