Far-ultraviolet studies. VI - Further limits on diffuse galactic light scattered at large angles by dust

Astronomy and Astrophysics – Astronomy

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Interstellar Matter, Ultraviolet Astronomy, Apollo 17 Flight, Astronomical Catalogs, Galactic Radiation, Light Scattering, Lyman Spectra, Ultraviolet Spectrometers

Scientific paper

The Apollo 17 wide-field far-ultraviolet spectrometer was used to scan six large bands of the sky during trans-earth coast. After accounting for internal scattered light and the light expected from stars in the field of view, no significant residual flux remains. This imposes important constraints on the scattering properties of the interstellar dust grains: either the grains are extremely strongly forward scattering, or the albedo of the grains is low. The absence of a scattered light signal from dusty, moderate galactic latitude regions of the sky indicates that the high galactic latitude flux reported by Henry et al. (1977) and by Anderson et al. (1979) does not represent starlight backscattered by dust.

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