Origin of magnetic fields in galaxies
Origin of magnetic fields in galaxies
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星系磁场的起源
DOI:
10.1103/physrevd.81.067301
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发表时间:
2009
影响因子:
5
通讯作者:
R. Opher
中科院分区:
文献类型:
--
作者:
R. S. Souza;R. Opher
Microgauss magnetic fields are observed in all galaxies at low and high redshifts. The origin of these intense magnetic fields is a challenging question in astrophysics. We show here that the natural plasma fluctuations in the primordial Universe (assumed to be random), predicted by the fluctuation -dissipation theorem, predicts {approx}0.034 {mu}G fields over {approx}0.3 kpc regions in galaxies. If the dipole magnetic fields predicted by the fluctuation-dissipation theorem are not completely random, microgauss fields over regions > or approx. 0.34 kpc are easily obtained. The model is thus a strong candidate for resolving the problem of the origin of magnetic fields in < or approx. 10{sup 9} years in high redshift galaxies.