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- Title
Generation of 10[sup 15]–10[sup 17] eV photons by ultrahigh-energy cosmic rays in the Galactic magnetic field.
- Authors
Dubovsky, S. L.; Tinyakov, P. G.
- Abstract
It is shown that the expected dip in the diffuse photon spectrum above the threshold of e[sup +]e[sup -] pair production, i.e., at energies 10[sup 15]-10[sup 17] eV, may be absent due to the synchrotron radiation by the electron component of the extragalactic ultrahigh-energy cosmic rays (UHE CRs) in the Galactic magnetic field. The mechanism we propose requires small (<2×10[sup -12] G) extragalactic magnetic fields and a large photon fraction in the UHE CRs. For a typical photon flux expected in top-down scenarios of UHE CRs, 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. © 1999 American Institute of Physics.
- Subjects
PHOTONS; COSMIC rays; GALACTIC magnetic fields
- Publication
JETP Letters, 1999, Vol 70, Issue 8, p495
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.568203