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The First Stars and Galaxies: Challenges for the Next Decade Participants
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Poster
Title: Generation of Magnetic Fields by the First Stars Author(s): Hajime Susa Abstract: There are various models that describe the generation of cosmological seed magnetic fields in the early universe. Among these models, the biggest amplitude of the seed field is predicted in models in which anisotropic radiation pressure around luminous sources like quasars or first stars drive weak electric currents in surrounding HII regions. However, this model was proposed assuming steady and linearized equations. In this paper, we investigate this issue in a time-dependent and nonlinear framework, solving radiation transfer equations and time-dependent ionization equations. As a result, we find 1) previous estimates of seed fields are too large, 2) this model can generate magnetic fields of $\sim 10^{-19} $G after modification if the radiation soure is a first star. We also will discuss its relation with Biermann battery effects.
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