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We report the first detection of an hourglass magnetic field aligned with awell-defined outflow-rotation system in a high-mass star-forming region. Theobservations were performed with Submillimeter Array toward G240.31+0.07, whichharbors a massive, flattened, and fragmenting molecular cloud core and awide-angle bipolar outflow. The polarized dust emission at 0.88 mm reveals aclear hourglass-shaped magnetic field aligned within 20 degree of the outflowaxis. Maps of high-density tracing spectral lines, e.g., H13CO+ (4-3), showthat the core is rotating about its minor axis, which is also aligned with themagnetic field axis. Therefore, both the magnetic field and kinematicproperties observed in this region are surprisingly consistent with thetheoretical predictions of the classic paradigm of isolated low-mass starformation. The strength of the magnetic field in the plane of sky is estimatedto be about 1.1 mG, resulting in a mass-to-magnetic flux ratio of 1.4 times thecritical value and a turbulent to ordered magnetic energy ratio of 0.4. We alsofind that the specific angular momentum almost linearly decreases from r~0.6 pcto 0.03 pc scales, which is most likely attributed to magnetic braking.

Submillimeter Array Observations of Magnetic Fields in G240.31+0.07: an Hourglass in a Massive Cluster-forming Core