Strong magnetic fields in normal galaxies at high redshift
Top Cited Papers
- 1 July 2008
- journal article
- Published by Springer Science and Business Media LLC in Nature
- Vol. 454 (7202), 302-304
- https://doi.org/10.1038/nature07105
Abstract
The origin and growth of magnetic fields in galaxies is still something of an enigma. It is generally assumed that seed fields are amplified over time through the dynamo effect, but there are few constraints on the timescale. It has recently been demonstrated that field strengths as traced by rotation measures of distant quasars are comparable to those seen today, but it was unclear whether the high fields were in the exotic environments of the quasars themselves or distributed along the line of sight. Here we demonstrate that the quasars with strong MgII absorption lines are unambiguously associated with larger rotation measures. Since MgII absorption occurs in the haloes of normal galaxies along the sightline to the quasars, this association requires that organized fields of surprisingly high strength are associated with normal galaxies when the Universe was only about one-third of its present age.Comment: 11 pages, 2 figures, Letter to Nature, accepted. Final version available at http://www.nature.com/nature/journal/v454/n7202/abs/nature07105.htmKeywords
This publication has 24 references indexed in Scilit:
- A Global Probe of Cosmic Magnetic Fields to High RedshiftsThe Astrophysical Journal, 2008
- HALO GAS CROSS SECTIONS AND COVERING FRACTIONS OF Mg II ABSORPTION SELECTED GALAXIESThe Astronomical Journal, 2008
- Optical Properties and Spatial Distribution of MgiiAbsorbers from SDSS Image StackingThe Astrophysical Journal, 2007
- Origin of cosmic magnetic fieldsAstronomische Nachrichten, 2006
- MgiiAbsorption Systems in Sloan Digital Sky Survey QSO SpectraThe Astrophysical Journal, 2005
- A Critical Review of Galactic DynamosAnnual Review of Astronomy and Astrophysics, 1999
- Fast dynamos, cosmic rays, and the Galactic magnetic fieldThe Astrophysical Journal, 1992
- QSO absorption lines and rotation measuresMonthly Notices of the Royal Astronomical Society, 1991
- The rotation measure distribution of QSOs and of intervening clouds - Magnetic fields and column densitiesThe Astrophysical Journal, 1984
- Absorption lines, Faraday rotation, and magnetic field estimates for QSO absorption-line cloudsThe Astrophysical Journal, 1982