Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1279..128i&link_type=abstract
DECIPHERING THE ANCIENT UNIVERSE WITH GAMMA-RAY BURSTS. AIP Conference Proceedings, Volume 1279, pp. 128-131 (2010).
Astronomy and Astrophysics
Astronomy
Gamma-Ray Sources (Astronomical), Intergalactic Matter, Star Formation, Redshift, Gamma-Ray Sources, Gamma-Ray Bursts, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Star Formation, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
We discuss the prospects for probing the ancient universe through high-energy gamma-ray from GRBs. UV intergalactic radiation fields (IRFs) during cosmic reionization can be probed through multi-GeV spectral absorption features due to photon-photon pair production. Using different IRF models including Pop III stars and consistent with existing observations, we show that spectral cutoffs are expected in the range of 10-100 GeV at z>6. This may be observable by Fermi or future arrays such as CTA, AGIS or 5at5, providing unique and critical information on the evolving IRF, the integrated cosmic star formation rate, and possibly also the escape fraction of UV photons from galaxies.
Choudhury Tirthankar Roy
Ciardi Benedetta
Ferrara Andrea
Inoue Susumu
Salvaterra Ruben
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