July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Probing cluster environments of blazars through gamma-gamma absorption

Aug 1, 2015, 3:30 PM
Mississippi Foyer (World Forum)

Mississippi Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 124
Poster contribution GA-TH Poster 2 GA


Iurii Sushch (North-West University)


Blazars, a class of radio-loud active galactic nuclei with their jets pointed close to the line of sight to Earth, are the most abundant extragalactic gamma-ray sources detected both by the Fermi Gamma-Ray Space Telescope and by groundbased atmospheric Cherenkov Telescope facilities. Most blazars are known to be hosted in giant Elliptical galaxies, but their cluster environments are poorly characterized. Very-high-energy (VHE; above ~10 GeV) gamma-rays emitted in the jet may be absorbed by low-energy (IR, optical) radiation through gamma-gamma pair production, leaving a characteristic imprint of the surrounding radiation field in the high-energy and VHE gamma-ray spectrum of the blazar. We study the possibility of the efficient absorption of the VHE gamma-rays in the cluster environments of gamma-ray bright blazars due to the intracluster light and/or close companion galaxies. We show that such absorption is negligible and should not affect the gamma-ray emission.
Registration number following "ICRC2015-I/" 826
Collaboration -- not specified --

Primary author

Iurii Sushch (North-West University)


Markus Böttcher (North-West University)

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