Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2012-03-29
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
21 pages, 14 figures; submitted to ApJ
Scientific paper
The flat spectrum radio quasar (FSRQ) 4C +21.35 (PKS 1222+216) displays prominent nuclear infrared emission from ~1200 K dust. A 70 -- 400 GeV flare with ~10 min variations during half an hour of observations was found by the MAGIC telescopes, and GeV variability was observed on sub-day timescales with the Large Area Telescope on Fermi. We examine 4C +21.35, assuming that it is a source of ultra-high energy cosmic rays (UHECRs). UHECR proton acceleration in the inner jet powers a neutral beam of neutrinos, neutrons and gamma rays from photopion production. The radiative efficiency and production spectra of neutrals formed through photohadronic processes with isotropic external target photons of the broad line region and torus are calculated. Secondary radiations made by this process have a beaming factor ~\delta^5, where \delta is the Doppler factor. The pair-production optical depth for gamma rays and the photopion efficiency for UHECR neutrons as they pass through external isotropic radiation fields are calculated. If target photons come from the broad line region and dust torus, large Doppler factors, \delta >~100 are required to produce rapidly variable secondary radiation with isotropic luminosity >~1e47 erg/s at the pc scale. The \gamma-ray spectra from leptonic secondaries are calculated from cascades initiated by the UHECR neutron beam at the pc-scale region and fit to the flaring spectrum of 4C +21.35. Detection of >~100 TeV neutrinos from 4C +21.35 or other VHE blazars with IceCube or KM3NeT would confirm this scenario.
Dermer Charles D.
Murase Kohta
Takami Hajime
No associations
LandOfFree
Variable Gamma-ray Emission Induced by Ultra-High Energy Neutral Beams: Application to 4C +21.35 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Variable Gamma-ray Emission Induced by Ultra-High Energy Neutral Beams: Application to 4C +21.35, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable Gamma-ray Emission Induced by Ultra-High Energy Neutral Beams: Application to 4C +21.35 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-57868