The Feasibility of Detecting X-Ray Halos Due to Intergalactic ``Cosmological'' Gray Dust

Details The Feasibility of Detecting X-Ray Halos Due to Intergalactic ``Cosmological'' Gray Dust The Feasibility of Detecting X-Ray Halos Due to Intergalactic ``Cosmological'' Gray Dust

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...564l..61w&link_type=abstract

The Astrophysical Journal, Volume 564, Issue 2, pp. L61-L64.

Astronomy and Astrophysics

Astronomy

2

Cosmology: Observations, Ism: Dust, Extinction, X-Rays: Ism

Scientific paper

Extinction due to large-diameter intergalactic gray (i.e., nonreddening) dust grains has been identified as a possible mechanism to explain the apparent systematic dimming of high-redshift Type Ia supernovae, an alternative hypothesis to the interpretation of this dimming as evidence of acceleration in the cosmological expansion of the universe. Detection of such dust grains could be achieved, in principle, through observations of the X-ray scattering halos surrounding high-redshift X-ray sources, produced by the intervening dust. I have calculated the expected intensity of such X-ray halos, as well as the halo intensity expected to result from Galactic dust; I find that the cosmological dust halo would be too faint to detect with current X-ray telescopes.

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