TeV gamma rays from blazars beyond z=1?
作者： Felix Aharonian , Warren Essey , Alexander Kusenko , Anton Prosekin
DOI: 10.1103/PHYSREVD.87.063002
关键词:
摘要: At TeV energies, the gamma-ray horizon of Universe is limited to redshifts $z\ensuremath{\ll}1$, and, therefore, any observation radiation from a source located beyond $z=1$ would call for revision standard paradigm. While robust observational evidence sources at $z\ensuremath{\ge}1$ lacking present, growing number blazars with as large $z\ensuremath{\simeq}0.5$ suggests possibility that blazar models may have be reconsidered. We show gamma rays can observed even $z\ensuremath{\ge}1$, if are secondary photons produced in interactions high-energy protons originating jet and propagating over cosmological distances almost rectilinearly. This mechanism was initially proposed possible explanation $z\ensuremath{\sim}0.2$, which some other explanations were possible. For detected this model provide only viable interpretation consistent conventional physics. It also far-reaching astronomical ramifications. In particular, imply extragalactic magnetic fields along line sight very weak, range ${10}^{\ensuremath{-}17}\text{ }\text{ }\mathrm{G}lBl{10}^{\ensuremath{-}14}\text{ }\mathrm{G}$, assuming random correlation length 1 Mpc, acceleration $E\ensuremath{\ge}{10}^{17}\text{ }\mathrm{eV}$ jets active galactic nuclei effective.
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