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Understanding the spectrum of a distant blazar PKS 1424+240 and its implications
Warren Essey, Alexander Kusenko
We calculate the gamma-ray spectrum of a distant blazar, PKS 1424+240, located at redshift z > 0.6035, where the optical depth to primary gamma rays of the highest observed energie…
Prospects for future very high-energy gamma-ray sky survey: impact of secondary gamma rays
Yoshiyuki Inoue, Oleg E. Kalashev, Alexander Kusenko
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…
PeV neutrinos from intergalactic interactions of cosmic rays emitted by active galactic nuclei
Oleg E. Kalashev, Alexander Kusenko, Warren Essey
The observed very high energy spectra of distant blazars are well described by secondary gamma rays produced in line-of-sight interactions of cosmic rays with background photons. I…