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星期六, 八月 22, 2009

Gilmore, Rudy C. 2009 预测Fermi等高能的观测率等

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从仪器的角度

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Title:
Modeling gamma-ray burst observations by Fermi and MAGIC including attenuation due to diffuse background light
Authors:
Gilmore, Rudy C.; Prada, Francisco; Primack, Joel R.
Publication:
eprint arXiv:0908.2830
Publication Date:
08/2009
Origin:
ARXIV
Keywords:
Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Comment:
13 pages, 10 figures, 3 tables, submitted to MNRAS
Bibliographic Code:
2009arXiv0908.2830G

Abstract

Gamma rays from extragalactic sources are attenuated by pair-production interactions with diffuse photons of the extragalactic background light (EBL). Gamma-ray bursts (GRBs) are a source of high-redshift photons above 10 GeV, and could be therefore useful as a probe of the evolving UV background radiation. In this paper, we develop a simple phenomenological model for the number and redshift distribution of gamma-ray bursts that can be seen at GeV energies with the Fermi satellite and MAGIC atmospheric Cherenkov telescope. We estimate the observed number of gamma rays per year, and show how this result is modified by considering interactions with different realizations of the evolving EBL. We also discuss the bright Fermi GRB 080916C in the context of this model. We find that the LAT on Fermi can be expected to see a small number of photons above 10 GeV each year from distant GRBs. Annual results for ground-based instruments like MAGIC are highly variable due to the low duty cycle and sky coverage of the telescope. However, successfully viewing a bright or intermediate GRB from the ground could provide hundreds of photons from high redshift, which would almost certainly be extremely useful in constraining both GRB physics and the high-redshift EBL.
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