AAS 201st Meeting, January, 2003
Session 79. Intergalactic Material: Its Structure and Composition
Poster, Wednesday, January 8, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[79.12U] A Search for X-ray Scattering by Intergalactic Dust

G. A. Telis, A. Petric, F. Paerels, D. J. Helfand (Columbia University)

We present the results of a search for an X-ray scattering halo around the bright, distant quasar QSO1508+5714 (z=4.30) in a deep observation with Chandra. We set an upper limit to the density of grey, smoothly distributed intergalactic dust. The limit rules out an explanation of the SN Ia Hubble Diagram purely in terms of intergalactic extinction, and may put constraints on the cosmic dust production and dispersal rates.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.