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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/205317
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- Strong magnetic fields in normal galaxies at high redshift
- Bernet, Martin L.; Miniati, Francesco; Lilly, Simon J.; Kronberg, Philipp P.; Dessauges-Zavadsky, Miroslava
- The origin and growth of magnetic fields in galaxies is still something of an enigma1. It is generally assumed that seed fields are amplified over time through the dynamo effectbut there are few constraints on the timescale. It was recently demonstrated that field strengths as traced by rotation measures of distant (and hence ancient) quasars are comparable to those seen today, but it was unclear whether the high fields were in the unusual environments of the quasars themselves or distributed along the lines of sight. Here we report high-resolution spectra that demonstrate that the quasars with strong Mg ii absorption lines are unambiguously associated with larger rotation measures. Because Mg ii absorption occurs in the haloes of normal galaxies along the sightlines to the quasars, this association requires that organized fields of surprisingly high strengths are associated with normal galaxies when the Universe was only about one-third of its present age.
- Publication type
- Journal article
- Nature, Vol. 454 (2008), pp. 302-304
- Publication year
- Data analysis; Galaxies; High-redshift; Magnetic fields
- Nature Publishing Group
- Publisher URL
- Copyright © 2008 Macmillan Publishers Limited. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed