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Paper: Magnetic Fields in Star-Forming Regions in the pre-ALMA Era: The SMA View
Volume: 499, Revolution in Astronomy with ALMA: The Third Year
Page: 197
Authors: Girart, J.; Zhang, Q.; Frau, P.; Qiu, K.; Liu, H.-B.; Tang, Y.-W.; Koch, P.
Abstract: We present results from an SMA Legacy project based on the observations of a total of 14 molecular clumps with embedded massive stars. The high resolution observations allow to trace the magnetic field in ≲0.1 pc cores embedded in the massive clumps. We found that the magnetic fields threading the massive clumps are in general relatively uniform. The magnetic fields appear, in most cases, to be perpendicular to the major axis of the filaments where the cores are embedded, and parallel to the large scale magnetic field. However, there is no correlation between the axis of molecular outflows associated with these dense cores and the magnetic field direction in the cores. Our findings suggest that magnetic fields play an important role during collapse of massive molecular clumps and the formation of dense cores at spatial scales of ≲0.1 pc. At the scale of an accretion disk, gravity and dynamic interactions in close binary or multiple systems dominate over magnetic fields. Therefore, outflows emanating from the disk do not maintain the magnetic direction in the 0.1pc core.
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