Gamma-ray induced cascades and magnetic fields in the intergalactic medium

[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 :

Pages :

23010

Peer reviewed :

Peer reviewed

Available on ORBi :

since 26 February 2013

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