AAS 201st Meeting, January, 2003
Session 97. Probing Dark Energy with SNAP
Oral, Wednesday, January 8, 2003, 10:00-11:30am, 602-604

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[97.03] A Direct Upper Limit on the Density of Intergalactic Dust

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

We present a preliminary upper limit on the density of smoothly distributed, large-grained intergalactic dust . The upper limit derives from the absence of a detectable X-ray scattering halo in a deep image of a bright, distant (z=4.3) quasar. The upper limit is well below dust densities that could have fundamentally affected the SN Ia Hubble Diagram.

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