Constraints on the optical properties of interstellar dust in the far-ultraviolet - Voyager observations of the diffuse sky background

Astronomy and Astrophysics – Astrophysics

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Background Radiation, Cosmic Dust, Diffuse Radiation, Far Ultraviolet Radiation, Interstellar Matter, Sky Radiation, Ultraviolet Spectra, Optical Properties, Satellite Observation, Ultraviolet Spectrometers, Voyager 2 Spacecraft

Scientific paper

Four regions of the sky have been observed at various Galactic latitudes and H I column densities, with the ultraviolet spectrometer aboard Voyager 2 finding no evidence for the presence of a diffuse radiation field between 912 and 1100 A at a level of 100-200 photons per sq cm s sr A. As starlight scattered by dust grains may be expected to be a major contributor to the diffuse background, especially at low Galactic latitudes, it is possible to place a very stringent upper limit of less than 0.1 on the reflectivity of the dust in this spectral range. This albedo is much lower than the canonical value of about 0.5 for standard graphite-silicate dust models.

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