Magnetic fields from reionisation

Abstract

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.

accepted for publication in A&A

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Cited by in corpus (26)

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• Lower Bounds on Magnetic Fields in Intergalactic Voids from Long-Term GeV-TeV Light Curves of the Blazar Mrk 421
• Faraday Rotation Measure due to the Intergalactic Magnetic Field II: the Cosmological Contribution
• Constraints on Primordial Magnetic Fields from Planck combined with the South Pole Telescope CMB B-mode polarization measurements
• Active Galactic Nuclei under the scrutiny of CTA
• On the First Generation of Stars
• Probing the Nature of the Weakest Intergalactic Magnetic Fields with the High Energy Emission of Gamma-Ray Bursts
• Detectability of Pair Echos from Gamma-Ray Bursts and Intergalactic Magnetic Fields
• Magnetogenesis around the first galaxies: the impact of different field seeding processes on galaxy formation
• Cosmic Magnetism in Centimeter and Meter Wavelength Radio Astronomy
• Fisher Analysis on Wide-Band Polarimetry for Probing the Intergalactic Magnetic Field
• Probing Early Cosmic Magnetic Fields through Pair Echos from High-Redshift GRBs
• Intergalactic Magnetogenesis at Cosmic Dawn by Photoionization
• Simulations and observational tests of primordial magnetic fields from Cosmic Microwave Background constraints
• Exploring the Intergalactic Magnetic Field by Means of Faraday Tomography
• Spectroscopy and multiband photometry of the afterglow of intermediate duration gamma-ray burst 040924 and its host galaxy
• Searching for Primordial Magnetic Fields with CMB B-modes
• Generation of Magnetic Field on the Accretion Disk around a Proto-First-Star
• Limits on primordial magnetic fields from primordial black hole abundance
• PVLAS Experiment: Some Astrophysical Consequences
• Fast magnetic field amplification in the early Universe: growth of collisionless plasma instabilities in turbulent media
• Mean Energy Density of Photogenerated Magnetic Fields Throughout the Epoch of Reionization
• Magnetizing the Cosmic Web during Reionization