Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-02
Astrophys.J.633:L5-L8,2005; Erratum-ibid.640:L109,2006
Astronomy and Astrophysics
Astrophysics
Ap.J.Letters, in press. Revision includes discussion of CIB and low-z blazars. Some typos corrected and minor error in Fig.2 c
Scientific paper
10.1086/498243
We discuss the contribution of Population III stars to the near-IR (NIR) cosmic infrared background (CIB) and its effect on spectra of high-$z$ high-energy gamma-ray bursts (GRBs). It is shown that if Population III were massive stars, the claimed NIR CIB excess will be reproduced if only ~ 4+/-2% of all baryons went through these stars. Regardless of the precise value of the NIR CIB produced by them, they would leave enough photons to provide a large optical depth for high-energy photons from high-z GRBs. Observations of such GRBs are expected following the planned launch of NASA's GLAST mission. The presence or absence of such damping in the spectra of high-$z$ GRBs will then provide important information on the emissions from the Population III. The location of this cutoff may also serve as an indicator of the GRB's redshift.
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