Article (Scientific journals)
Gamma-ray induced cascades and magnetic fields in the intergalactic medium
Elyiv, Andrii; Neronov, A.; Semikoz, D. V.
2009In Physical Review. D, Particles and Fields, 80, p. 23010
Peer reviewed
 

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Keywords :
gamma-ray; Electric and magnetic fields; Observational cosmology
Abstract :
[en] We present the results of Monte Carlo simulations of three-dimensional electromagnetic cascade initiated by interactions of the multi-TeV γ rays with the cosmological infrared/optical photon background in the intergalactic medium. Secondary electrons in the cascade are deflected by the intergalactic magnetic fields before they scatter on CMB photons. This leads to extended 0.1°-10° scale emission at multi-GeV and TeV energies around extragalactic sources of very high-energy γ rays. The morphology of the extended emission depends, in general, on the properties of magnetic fields in the intergalactic medium. Using Monte Carlo simulated data sets, we demonstrate that the decrease of the size of extended source with the increase of energy allows to measure weak magnetic fields with magnitudes in the range from ≤10[SUP]-16[/SUP]G to 10[SUP]-12[/SUP]G if they exist in the voids of the large scale structure.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Elyiv, Andrii ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Neronov, A.
Semikoz, D. V.
Language :
English
Title :
Gamma-ray induced cascades and magnetic fields in the intergalactic medium
Publication date :
2009
Journal title :
Physical Review. D, Particles and Fields
ISSN :
0556-2821
eISSN :
1089-4918
Publisher :
American Physical Society, College Park, United States - Maryland
Volume :
80
Pages :
23010
Peer reviewed :
Peer reviewed
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