18–21 Nov 2019
Hotel Guanajuato, Ciudad de Guanajuato, Mexico
America/Mexico_City timezone

Multi-TeV flaring from high energy blazars: An evidence of the photohadronic process

Not scheduled
20m
Hotel Guanajuato, Ciudad de Guanajuato, Mexico

Hotel Guanajuato, Ciudad de Guanajuato, Mexico

Dolares, Guanajuato, A Dolores Hidalgo km 2.5, San Javier, 36020 Guanajuato, Gto., Mexico

Speaker

Mr Carlos Eduardo Lopez Fortin (Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México)

Description

The high energy peaked blazars are known to undergo episodes of flaring in GeV-TeV gamma-rays involving different time scales and the flaring mechanism is not yet well understood despite long term simultaneous multiwavelength observations. These gamma-rays en route to Earth undergo attenuation by the extra galactic background light.
Using the photohadronic model, where the seed photons of the jet follow a power-law spectrum and considering a template extragalactic background light model, we derive a simple relation between the observed multi-TeV gamma-ray flux and the intrinsic flux which depends on a single parameter. We study 42 flaring epochs of 23 blazars and found an excellent fit to most of the observed spectra, further supporting the photohadronic origin of multi-TeV gamma-rays.
We note that we can also constrain the power spectrum of the seed photons during the flaring period. Moreover, for blazars of unknown redshifts whose multi-TeV flaring spectra are known, stringent bounds on the former can be placed using the photohadronic model.

Primary authors

Dr Sarira Sahu (Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México) Mr Carlos Eduardo Lopez Fortin (Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México)

Co-author

Dr Shigehiro Nagataki (Astrophysical Big Bang Laboratory, RIKEN)

Presentation materials

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