Seed Magnetic Fields Generated by Primordial Supernova Explosions

Abstract

The origin of the magnetic field in galaxies is an open question in astrophysics. Several mechanisms have been proposed related, in general, with the generation of small seed fields amplified by a dynamo mechanism. In general, these mechanisms have difficulty in satisfying both the requirements of a sufficiently high strength for the magnetic field and the necessary large coherent scales. We show that the formation of dense and turbulent shells of matter, in the multiple explosion scenario of Miranda and Opher (1996, 1997) for the formation of the large-scale structures of the Universe, can naturally act as a seed for the generation of a magnetic field. During the collapse and explosion of Population III objects, a temperature gradient not parallel to a density gradient can naturally be established, producing a seed magnetic field through the Biermann battery mechanism. We show that seed magnetic fields $\sim 10^{-12}-10^{-14}G$ can be produced in this multiple explosion scenario on scales of the order of clusters of galaxies (with coherence length $L\sim 1.8Mpc$) and up to $\sim 4.5\times 10^{-10}G$ on scales of galaxies ($L\sim 100kpc$).

Accepted for publication in MNRAS, 5 pages (MN plain TeX macros v1.6 file). Also available at http://www.iagusp.usp.br/~oswaldo (click "OPTIONS" and then "ARTICLES")

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• Self consistent estimates of magnetic fields from reheating
• Constraint on the primordial vector mode and its magnetic field generation from seven-year Wilkinson Microwave Anisotropy Probe Observations
• The Origin of Magnetic Fields in Galaxies
• Protogalactic Extension of the Parker Bound
• Suppression of small baryonic structures due to a primordial magnetic field
• Generation of magnetic fields in Einstein-Aether gravity
• Effects of non-linearities on magnetic field generation
• The Origin of Primordial Magnetic Fields
• Flavon Magneto-Baryogenesis
• Magnetogenesis by Wave-Driven Momentum Exchange
• Random Primordial Magnetic Fields and the Gas Content of Dark Matter Halos
• Biermann Mechanism in Primordial Supernova Remnant and Seed Fields
• Challenges of Relativistic Astrophysics