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The centre of our Milky Way harbours the closest candidate for a supermassiveblack hole. The source is thought to be powered by radiatively inefficientaccretion of gas from its environment. This form of accretion is a standardmode of energy supply for most galactic nuclei. X-ray measurements have alreadyresolved a tenuous hot gas component from which it can be fed. However, themagnetization of the gas, a crucial parameter determining the structure of theaccretion flow, remains unknown. Strong magnetic fields can influence thedynamics of the accretion, remove angular momentum from the infalling gas,expel matter through relativistic jets and lead to the observed synchrotronemission. Here we report multi-frequency measurements with several radiotelescopes of a newly discovered pulsar close to the Galactic Centre and showthat its unusually large Faraday rotation indicates a dynamically relevantmagnetic field near the black hole. If this field is accreted down to the eventhorizon it provides enough magnetic flux to explain the observed emission fromthe black hole, from radio to X-rays.

A strong magnetic field around the supermassive black hole at the centre of the Galaxy