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Context: The role of magnetic fields during high-mass star formation is amatter of fierce debate, yet only a few direct probes of magnetic fieldstrengths are available.  Aims: The magnetic field is detected in a number of massive star-formingregions through polarization observations of 6.7 GHz methanol masers. Althoughthese masers are the most abundant of the maser species occurring duringhigh-mass star formation, most magnetic field measurements in the high-densitygas currently come from OH and H2 O maser observations.  Methods: The 100-m Effelsberg telescope was used to measure the Zeemansplitting of 6.7 GHz methanol masers for the first time. The observations wereperformed on a sample of 24 bright northern maser sources.  Results: Significant Zeeman splitting is detected in 17 of the sources withan average magnitude of 0.56 m/s . Using the current best estimate of the 6.7GHz methanol maser Zeeman splitting coefficient and a geometrical correction,this corresponds to an absolute magnetic field strength of 23 mG in themethanol maser region.  Conclusions: The magnetic field is dynamically important in the dense maserregions. No clear relation is found with the available OH maser magnetic fieldmeasurements. The general sense of direction of the magnetic field isconsistent with other Galactic magnetic field measurements, although a few ofthe masers display a change of direction between different maser features. Dueto the abundance of methanol masers, measuring their Zeeman splitting providesthe opportunity to construct a comprehensive sample of magnetic fields inhigh-mass star-forming regions.

A new probe of magnetic fields during high-mass star formation: Zeeman splitting of 6.7 GHz methanol masers