Journal
ASTROPARTICLE PHYSICS
Volume 54, Issue -, Pages 118-124Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2013.12.001
Keywords
Active galactic nuclei; Survey; Gamma rays; Cosmic rays
Funding
- Research Fellowship of the Japan Society for the Promotion of Science (JSPS)
- Russian Ministry of Education and Science [8412]
- President of the Russian Federation [NS-5590.2012.2]
- RFBR [13-0201293]
- Department of Energy [DE-SC0009937]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- NSF [PHY1066293]
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Very high-energy gamma-ray measurements of distant blazars can be well explained by secondary gamma rays emitted by cascades induced by ultra-high-energy cosmic rays. The secondary gamma rays will enable one to detect a large number of blazars with future ground based gamma-ray telescopes such as Cherenkov Telescope Array (CIA). We show that the secondary emission process will allow CIA to detect 100, 130, 150, 87, and 8 blazars above 30 GeV, 100 GeV, 300 GeV, 1 TeV, and 10 TeV, respectively, up to z similar to 8 assuming the intergalactic magnetic field (IGMF) strength B =10(-17) G and an unbiased all sky survey with 0.5 h exposure at each field of view, where total observing time is similar to 540 h. These numbers will be 79, 96, 110, 63, and 6 up to z similar to 5 in the case of B =10(-15) G. This large statistics of sources will be a clear evidence of the secondary gamma-ray scenarios and a new key to studying the IGMF statistically. We also find that a wider and shallower survey is favored to detect more and higher redshift sources even if we take into account secondary gamma rays. (C) 2013 Elsevier B.V. All rights reserved.
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