Testing models of extragalactic γ-ray propagation using observations of extreme blazars in GeV and TeV energy ranges

International Conference on Particle Physics and Astrophysics

物理学;天文学

Dzhatdoev, T.A.^1 ; Khalikov, E.V.^1 ; Kircheva, A.P.^1,2 ; Lyukshin, A.A.^2

Fed. State Budget Educational Institution of Higher Education M.V. Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU), 1(2), Leninskie gory, GSP-1, Moscow

119991, Russia^1

Fed. State Budget Educational Institution of Higher Education M.V. Lomonosov Moscow State University, Department of Physics, 1(2), Leninskie gory, GSP-1, Moscow

119991, Russia^2

关键词: Electromagnetic cascades;    Energy ranges;    Extragalactic magnetic fields;    Imaging Cherenkov telescopes;    Lower limits;    Ray propagation;    Secondary components;    Testing models;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012002/pdf
DOI  :  10.1088/1742-6596/798/1/012002

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We briefly review contemporary extragalactic γ-ray propagation models. It is shown that the Extragalactic Magnetic Field (EGMF) strength and structure are poorly known. Strict lower limits on the EGMF strength in voids are of order 10-17- 10-20G, thus allowing a substantial contribution of a secondary component generated by electromagnetic cascades to the observable spectrum. We show that this "electromagnetic cascade model" is supported by data from imaging Cherenkov telescopes and the Fermi LAT detector.