The Feasibility of Detecting X-Ray Halos Due to Intergalactic 'Cosmological' Gray Dust
| Autor: | David Lee Windt |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Physics
Scattering Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Intergalactic dust Dust lane Metric expansion of space Supernova Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Intergalactic travel Astrophysics::Earth and Planetary Astrophysics Halo Astrophysics::Galaxy Astrophysics Cosmic dust |
| Zdroj: | The Astrophysical Journal. 564:L61-L64 |
| ISSN: | 0004-637X |
| DOI: | 10.1086/339019 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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