A lower limit of 50 microgauss for the magnetic field near the Galactic Centre

Roland M. Crocker (), David I. Jones, Fulvio Melia, Jürgen Ott and Raymond J. Protheroe
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Roland M. Crocker: School of Physics, Monash University
David I. Jones: Max-Planck-Institut für Kernphysik, PO Box 103980, Heidelberg, Germany
Fulvio Melia: The Applied Math Program, and Steward Observatory, The University of Arizona, Tucson, Arizona 85721, USA
Jürgen Ott: National Radio Astronomical Observatory, Charlottesville, PO Box O, 1003 Lopezville Road, Socorro, New Mexico 87801-0387, USA
Raymond J. Protheroe: School of Physics and Chemistry, University of Adelaide, North Terrace, South Australia 5005, Australia

Nature, 2010, vol. 463, issue 7277, 65-67

Abstract: Centre of attraction There is ample evidence of a magnetic field near the centre of our Galaxy, but much uncertainty as to its strength. Estimates vary from the microgauss to the milligauss range — and values as great as 1,000 microgauss, about 10,000 times stronger than typical for the bulk of the Galaxy, have been reported. A new analysis of published radio and γ-ray data reveals a downward break in the region's non-thermal radio spectrum that suggests a Galactic Centre magnetic field of 50 microgauss or more. Taken with other evidence, the authors conclude that a field strength of about 100 microgauss is probable, on a par with that found in the inner regions of starburst galaxies.

Date: 2010
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DOI: 10.1038/nature08635

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