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Magnetic fields are fundamental to the evolution of galaxies, playing a keyrole in the astrophysics of the interstellar medium and star formation.Large-scale ordered magnetic fields have been mapped in the Milky Way andnearby galaxies, but it is not known how early in the Universe such structuresform. Here we report the detection of linearly polarized thermal emission fromdust grains in a strongly lensed, intrinsically luminous galaxy that is formingstars at a rate more than a thousand times that of the Milky Way at redshift2.6, within 2.5 Gyr of the Big Bang. The polarized emission arises from thealignment of dust grains with the local magnetic field. The median polarizationfraction is of order one per cent, similar to nearby spiral galaxies. Ourobservations support the presence of a 5 kiloparsec-scale ordered magneticfield with a strength of around 500uG or lower, orientated parallel to themolecular gas disk. This confirms that such structures can be rapidly formed ingalaxies, early in cosmic history.

Polarized thermal emission from dust in a galaxy at redshift 2.6