Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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LARGE SCALE MAGNETOGENESIS THROUGH RADIATION PRESSURE

  • LANGER MATHIEU (Astrophysics, Denys Wilkinson Building, Keble Road) ;
  • PUGET JEAN-LOUP (Institut d'Astrophysique Spatiale, Universite Paris-Sud) ;
  • AGHANIM NABILA (Institut d'Astrophysique Spatiale, Universite Paris-Sud)
  • Published : 2004.12.01
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Abstract

We present a new model for the generation of magnetic fields on large scales occurring at the end of cosmological reionisation. The inhomogeneous radiation provided by luminous sources and the fluctuations in the matter density field are the major ingredients of the model. More specifically, differential radiation pressure acting on ions and electrons gives rise to electric currents which induce magnetic fields on large scales. We show that on protogalactic scales, this process is highly efficient, leading to magnetic field amplitudes of the order of $10^{-1l}$ Gauss. While remaining of negligible dynamical impact, those amplitudes are million times higher than those obtained in usual astrophysical magnetogenesis models. Finally, we derive the relation between the power spectrum of the generated field and the one of the matter density fluctuations. We show in particular that magnetic fields are preferably created on large (galactic or cluster) scales. Small scale magnetic fields are strongly disfavoured, which further makes the process we propose an ideal candidate to explain the origin of magnetic fields in large scale structures.

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References

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