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We calculate the spectrum and high-energy background flux from photomeson production in active galactic nuclei (AGN), using the recent UV and x-ray observations to define the photon fields and an accretion-disk shock-acceleration model for producing high-energy particles. Collectively, AGN produce the dominant isotropic background between 10^4 and 10^10 GeV, detectable with current instruments. AGN 's should produce a sphere of stellar disruption which may explain the ``broad-line region'' seen in AGN.
Stecker et al. (Mon,) studied this question.
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