An 84-μG magnetic field in a galaxy at redshift z = 0.692

Arthur M. Wolfe (), Regina A. Jorgenson, Timothy Robishaw, Carl Heiles and Jason X. Prochaska
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Arthur M. Wolfe: University of California, San Diego, La Jolla, California 92093-0424, USA
Regina A. Jorgenson: University of California, San Diego, La Jolla, California 92093-0424, USA
Timothy Robishaw: University of California, Berkeley, California 94720-3411, USA
Carl Heiles: University of California, Berkeley, California 94720-3411, USA
Jason X. Prochaska: UCO-Lick Observatory; University of California, Santa Cruz, Santa Cruz, California 95464, USA

Nature, 2008, vol. 455, issue 7213, 638-640

Abstract: Galactic magnetism: not what it used to B The magnetic field that pervades our Galaxy is an important constituent of the interstellar medium. Similar fields, known as B fields, seem to be present in galaxies with redshifts of z > 1, though the strength remains uncertain. Wolfe et al. report a measurement of a magnetic field B ≈ 84 µG in a galaxy at z = 0.692, using the same Zeeman-splitting technique that revealed an average value of B = 6 µG in the neutral interstellar gas of our Galaxy. This is completely unexpected since the leading theory of magnetic field generation, the dynamo model, predicts large-scale B fields to be weaker rather than stronger in the past.

Date: 2008
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DOI: 10.1038/nature07264

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