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Magnetic fields likely play an important role in star formation, but thenumber of directly measured magnetic field strengths remains scarce. Weobserved the 38.3 and 38.5 GHz Class II methanol (CH$_3$OH) maser lines towardthe high mass star forming region NGC 6334F for the Zeeman effect. The observedspectral profiles have two prominent velocity features which can be furtherdecomposed through Gaussian component fitting. In several of these fittedGaussian components we find significant Zeeman detections, with $zB_{\rm los}$in the range from 8 to 46 Hz. If the Zeeman splitting factor $z$ for the 38 GHztransitions is of the order of $\sim$1 Hz mG$^{-1}$, similar to that forseveral other CH$_3$OH maser lines, then magnetic fields in the regions tracedby these masers would be in the range of 8-46 mG. Such magnetic field values inhigh mass star forming regions agree with those detected in the better-known6.7 GHz Class II CH$_3$OH maser line. Since Class II CH$_3$OH masers areradiatively pumped close to the protostar and likely occur in the accretiondisk or the interface between the disk and outflow regions, such fields likelyhave significant impact on the dynamics of these disks.

The Discovery of the Zeeman Effect in 38 GHz Class II Methanol Masers