Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-11-03
Astrophys.J. 745 (2012) L16
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
5 pages, 4 figures, ApJL in press, minor changes
Scientific paper
10.1088/2041-8205/745/2/L16
The photomeson production in ultra-high-energy cosmic-ray (UHECR) accelerators such as gamma-ray bursts and active galaxies may lead to ultra-high-energy (UHE) gamma-ray emission. We show that generation of UHE pairs in magnetized structured regions embedding the sources is inevitable, and accompanied >0.1 TeV synchrotron emission provides an important probe of UHECR acceleration. It would especially be relevant for powerful transient sources, and synchrotron pair echoes may be detected by future CTA via coordinated search for transients of duration ~0.1-1 yr for the structured regions with ~Mpc. Detections will be useful for knowing structured extragalactic magnetic fields as well as properties of the sources.
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