Skip to Main content Skip to Navigation
Journal articles

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

Abstract : Earth's nearest candidate supermassive black hole lies at the centre of the Milky Way. Its electromagnetic emission is thought to be powered by radiatively inefficient accretion of gas from its environment, which is a standard mode of energy supply for most galactic nuclei. X-ray measurements have already resolved a tenuous hot gas component from which the black hole can be fed. The magnetization of the gas, however, which is a crucial parameter determining the structure of the accretion flow, remains unknown. Strong magnetic fields can influence the dynamics of accretion, remove angular momentum from the infalling gas, expel matter through relativistic jets and lead to synchrotron emission such as that previously observed. Here we report multi-frequency radio measurements of a newly discovered pulsar close to the Galactic Centre and show that the pulsar's unusually large Faraday rotation (the rotation of the plane of polarization of the emission in the presence of an external magnetic field) indicates that there is a dynamically important magnetic field near the black hole. If this field is accreted down to the event horizon it provides enough magnetic flux to explain the observed emission-from radio to X-ray wavelengths-from the black hole.
Complete list of metadata

Cited literature [23 references]  Display  Hide  Download
Contributor : Nathalie Rouchon Connect in order to contact the contributor
Submitted on : Monday, October 3, 2016 - 2:22:26 PM
Last modification on : Tuesday, October 12, 2021 - 5:20:35 PM
Long-term archiving on: : Friday, February 3, 2017 - 1:48:02 PM


Files produced by the author(s)


Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License




R. P. Eatough, H. Falcke, R. Karuppusamy, K. J. Lee, D. J. Champion, et al.. A strong magnetic field around the supermassive black hole at the centre of the Galaxy. Nature, Nature Publishing Group, 2013, 501 (7467), pp.391-394. ⟨10.1038/nature12499⟩. ⟨insu-01287991⟩



Record views


Files downloads