Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars

Details Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars

2010-06-17

arxiv.org/abs/1006.3504v1

Science 328, 73 (2010)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

14 pages, 3 figures

Scientific paper

Magnetic fields in galaxies are produced via the amplification of seed magnetic fields of unknown nature. The seed fields, which might exist in their initial form in the intergalactic medium, were never detected. We report a lower bound $B\ge 3\times 10^{-16}$~gauss on the strength of intergalactic magnetic fields, which stems from the nonobservation of GeV gamma-ray emission from electromagnetic cascade initiated by tera-electron volt gamma-ray in intergalactic medium. The bound improves as $\lambda_B^{-1/2}$ if magnetic field correlation length, $\lambda_B$, is much smaller than a megaparsec. This lower bound constrains models for the origin of cosmic magnetic fields.

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