Origin of magnetic fields in galaxies

Autor(es)

de Souza, Rafael S. ; Opher, Reuven

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW D; v. 81, n. 6, p. 4-pg., 2010-03-15.

Resumo

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 similar to 0.034 mu G fields over similar to 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 greater than or similar to 0.34 kpc are easily obtained. The model is thus a strong candidate for resolving the problem of the origin of magnetic fields in less than or similar to 10(9) years in high redshift galaxies. (AU)

• Processo FAPESP: 00/06770-2 - Radiação cósmica de fundo em microondas e formação de estruturas no universo
• Beneficiário: Reuven Opher
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/05176-4 - Análise da influência de campos magnéticos e matéria escura na formação e evolução de galáxias
• Beneficiário: Rafael da Silva de Souza
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado