Séminaire / Seminar GReCO |
| « Probing the very high-redshift universe through high-energy gamma-rays » |
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S. Inoue |
| We discuss potential ways to study the universe at very high redshifts (z>5) through GeV-TeV gamma-rays emitted by extragalactic sources such as gamma-ray bursts or blazars. In particular, expectations are presented for the absorption of gamma-rays by intergalactic pair production at these redshifts, and the implications thereof for probing the evolution of the UV background in the era of early star formation and cosmic reionization (Inoue et al. arXiv:0906.2495, Inoue et al., in prep.). We also briefly mention the possibility of probing weak intergalactic/interstellar magnetic fields at z>10. The relevant observational prospects are addressed for current and future facilities such as the Fermi satellite and the Cherenkov Telescope Array. |
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lundi 7 septembre 2009 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |