Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-20
Astrophys.J.651:41-45,2006
Astronomy and Astrophysics
Astrophysics
14 pages, 2 figures. to appear in ApJ, vol. 651, Nov. 2006
Scientific paper
10.1086/507667
We report on the results of a search for an intergalactic X-ray dust scattering halo in a deep observation of the bright, high-redshift quasar QSO 1508+5714 with the Chandra X-ray Observatory. We do not detect such a halo. Our result implies an upper limit on the density of diffuse, large-grained intergalactic dust of Omega_ dust < 2 x 10^-6, assuming a characteristic grain size of 1micron. The result demonstrates the sensitivity of this technique for detecting very small amounts of intergalactic dust which are very hard to detect otherwise. This will allow us to put important constraints on systematic effects induced by extinction on the interpretation of the SN Ia Hubble Diagram, as well as on the amount and properties of cosmological dust being expelled into the intergalactic medium at early z~2 times.
Helfand David J.
Paerels Frederic
Petric Andreea Oana
Telis Gisela A.
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