Generation of scaled protogalactic seed magnetic fields in laser-produced shock waves

G. Gregori (1, 2) , A. Ravasio (3) , C. D. Murphy (1) , K. Schaar (1) , A. Baird (1) , A. R. Bell (1) , A. Benuzzi-Mounaix (3) , R. Bingham (2) , C. Constantin (4) , R. P. Drake (5) , M. Edwards (1) , E. T. Everson (4) , C. D. Gregory (6) , Y. Kuramitsu (7) , W. Lau (1) , J. Mithen (1) , C. Niemann (4) , H.-S. Park (8) , B. A. Remington (8) , B. Reville (1) , A. P. L. Robinson (2) , D. D. Ryutov (8) , Y. Sakawa (7) , S. Yang (9, 1) , N. C. Woolsey (6) , M. Koenig (3) , F. Miniati (10)

1 Department of Physics [Oxford]
2 Rutheford Appleton Laboratory
3 LULI - Laboratoire pour l'utilisation des lasers intenses
4 UCLA - University of California [Los Angeles]
5 AOSS - Department of Atmospheric, Oceanic, and Space Sciences [Ann Arbor]
6 Department of Physics
7 Institute of Laser Engineering
8 LLNL - Lawrence Livermore National Laboratory
9 MPQ - Max-Planck-Institut für Quantenoptik
10 Physics Department

The standard model for the origin of galactic magnetic fields is through the amplification of seed fields via dynamo or turbulent processes to the level consistent with present observations1, 2, 3. Although other mechanisms may also operate4, 5, currents from misaligned pressure and temperature gradients (the Biermann battery process) inevitably accompany the formation of galaxies in the absence of a primordial field. Driven by geometrical asymmetries in shocks6 associated with the collapse of protogalactic structures, the Biermann battery is believed to generate tiny seed fields to a level of about 10−21 gauss (refs 7, 8). With the advent of high-power laser systems in the past two decades, a new area of research has opened in which, using simple scaling relations9, 10, astrophysical environments can effectively be reproduced in the laboratory11, 12. Here we report the results of an experiment that produced seed magnetic fields by the Biermann battery effect. We show that these results can be scaled to the intergalactic medium, where turbulence, acting on timescales of around 700 million years, can amplify the seed fields13, 14 sufficiently to affect galaxy evolution

Domains: Galactic Astrophysics [astro-ph.GA]; Galactic Astrophysics [astro-ph.GA]

G. Gregori, A. Ravasio, C. D. Murphy, K. Schaar, A. Baird, et al.. Generation of scaled protogalactic seed magnetic fields in laser-produced shock waves. Nature, 2012, 481 (7382), pp.480-483. ⟨10.1038/nature10747⟩. ⟨cea-00881406⟩