Sensitivity of gamma-ray telescopes for detection of magnetic fields in intergalactic medium

Details Sensitivity of gamma-ray telescopes for detection of magnetic fields in intergalactic medium Sensitivity of gamma-ray telescopes for detection of magnetic fields in intergalactic medium

2009-10-10

arxiv.org/abs/0910.1920v1

Phys.Rev.D80:123012,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages

Scientific paper

10.1103/PhysRevD.80.123012

We explore potential of current and next-generation gamma-ray telescopes for the detection of weak magnetic fields in the intergalactic medium. We demonstrate that using two complementary techniques, observation of extended emission around point sources and observation of time delays in gamma-ray flares, one would be able to probe most of the cosmologically and astrophysically interesting part of the "magnetic field strength" vs. "correlation length" parameter space. This implies that gamma-ray observations with Fermi and ground-based Cherenkov telescopes will allow to (a) strongly constrain theories of the origin of magnetic fields in galaxies and galaxy clusters and (b) discover, constrain or rule out the existence of weak primordial magnetic field generated at different stages of evolution of the Early Universe.

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