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VOLUME 70 (1999) | ISSUE 8 | PAGE 487
Generation of 1015-1017 eV photons by Ultra-High Energy Cosmic Rays in the Galactic magnetic filed
PACS: 98.70.Sa
We show that the dip expected in the diffuse photon spectrum above the threshold of e~*~e^-pair production, i.e., at energies 1015 — 1017 eV, may be absent due to the synchrotron radiation by the electron component of the extragalactic Ultra-High Energy Cosmic Rays (UHECR) in the Galactic magnetic filed. The mechanism we propose requires small (< 2 ■ 10~12 G) extragalactic magnetic fields and large fraction of photons in the UHECR. For a typical photon flux expected in top-down scenarios of UHECR, the predicted flux in the region of the dip is close to the existing experimental limit. The sensitivity of our mechanism to the extragalactic magnetic field may be used to improve existing bounds on the latter by two orders of magnitude.