High-Energy Cosmology
نویسنده
چکیده
Our knowledge of the high-energy universe will change dramatically over the next several years as new astronomical detectors of high-energy radiation reach their design sensitivities. Besides Swift and HESS, which are already making important discoveries, these include the ground-based imaging air-Cherenkov telescopes VERITAS and MAGIC, the γ-ray space telescopes GLAST and AGILE, and the particle observatories IceCube and Auger. A formalism for calculating statistical properties of cosmological γ-ray sources is presented. Application is made to model calculations of the statistical distributions of γ-ray and neutrino emission from beamed sources, specifically, long-duration GRBs, blazars, and extagalactic microquasars, and unbeamed sources, including normal galaxies, starburst galaxies and clusters. Expressions for the integrated intensities of faint beamed and unbeamed high-energy radiation sources are also derived. A toy model for the background intensity of radiation from dark-matter annihilation taking place in the early universe is constructed. Estimates for the γ-ray fluxes of local group galaxies, starburst, and infrared luminous galaxies are briefly reviewed. Because the brightest extragalactic γ-ray sources are flaring sources, and these are the best targets for sources of PeV – EeV neutrinos and ultra-high energy cosmic rays, rapidly slewing all-sky telescopes like MAGIC and an all-sky γ-ray observatory beyond Milagro will be crucial for optimal science return in the multi-messenger age.
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