Magnetic fields from reionisation

Details Magnetic fields from reionisation Magnetic fields from reionisation

2005-08-08

arxiv.org/abs/astro-ph/0508173v1

Astron.Astrophys. 443 (2005) 367

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20053372

We present a complementary study to a new model for generating magnetic fields of cosmological interest. The driving mechanism is the photoionisation process by photons provided by the first luminous sources. Investigating the transient regime at the onset of inhomogeneous reionisation, we show that magnetic field amplitudes as high as $2 \times 10^{-16}$ Gauss can be obtained within a source lifetime. Photons with energies above the ionisation threshold accelerate electrons, inducing magnetic fields outside the Stroemgren spheres which surround the ionising sources. Thanks to their mean free path, photons with higher energies propagate further and lead to magnetic field generation deeper in the neutral medium. We find that soft X-ray photons could contribute to a significant premagnetisation of the intergalactic medium at a redshift of z=15.

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