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Strong magnetic fields in normal galaxies at high redshift

Author

Listed:
  • Martin L. Bernet

    (ETH Zürich, Wolfgang-Pauli-Strasse 16, CH-8093 Zürich, Switzerland)

  • Francesco Miniati

    (ETH Zürich, Wolfgang-Pauli-Strasse 16, CH-8093 Zürich, Switzerland)

  • Simon J. Lilly

    (ETH Zürich, Wolfgang-Pauli-Strasse 16, CH-8093 Zürich, Switzerland)

  • Philipp P. Kronberg

    (Los Alamos National Laboratory, IGPP, PO Box 1663, Los Alamos, New Mexico 87545, USA
    University of Toronto, 60 St George Street, Toronto, Ontario M5S 1A7, Canada)

  • Miroslava Dessauges–Zavadsky

    (Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland)

Abstract

Strong magnetic fields Little is known about the origin of the magnetic fields in today's galaxies because of the difficulty of detecting magnetism in the distant Universe. An indirect observation technique can help. A study of a sample of quasars with strong Mg ii absorption lines shows that they are associated with larger Faraday rotation measures, indicative of high-strength magnetic fields. Mg ii absorption is a characteristic of the haloes of normal galaxies, seen in projection in front of background polarized quasars. These observations suggest that completely normal galaxies contained magnetic fields, with strengths comparable to those seen today, when the Universe was only about a third of its present age.

Suggested Citation

  • Martin L. Bernet & Francesco Miniati & Simon J. Lilly & Philipp P. Kronberg & Miroslava Dessauges–Zavadsky, 2008. "Strong magnetic fields in normal galaxies at high redshift," Nature, Nature, vol. 454(7202), pages 302-304, July.
    • Handle: RePEc:nat:nature:v:454:y:2008:i:7202:d:10.1038_nature07105
    DOI: 10.1038/nature07105
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