Abstract
The imaging capabilities of the Exosat and Einstein satellites at soft X-ray wavelengths have begun to show that suitable Galactic X-ray sources have extended (∼ 10 arcmin) haloes due to scattering of soft X-rays by interstellar dust. A simple argument suggests that similar haloes, due to scattering by intergalactic dust, should exist around distant (z ∼ 1) quasars and detailed analysis confirms this conclusion. A search for such haloes around suitable X-ray quasars could provide valuable, model-independent, constraints on the amount and origin of intergalactic dust.
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Evans, A., Norwell, G. & Bode, M.F. X-ray scattering by intergalactic dust. Space Sci Rev 40, 701–704 (1985). https://doi.org/10.1007/BF00179890
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DOI: https://doi.org/10.1007/BF00179890