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Paper: VLBA Magnetic Field Observations in Star Forming Regions
Volume: 340, Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA
Page: 364
Authors: Sarma, A.P.; Troland, T.H.; Romney, J.D.
Abstract: Magnetic fields are known to play an important role in star formation. The Zeeman effect remains the most direct method for measuring magnetic field strengths in the interstellar medium. Observations of the Zeeman effect in water masers with the VLBA offer a unique window into magnetic fields in the highest density regions at extreme spatial resolution. We report on a long-term program to measure magnetic field strengths in star forming regions with the VLBA. A highly successful pilot study of circular polarization in water masers yielded field strengths ranging from 14 to 42 milligauss in the W3 IRS 5 star forming region. Previous VLA observations revealed magnetic fields between 20 and 40 milligauss in the W3(OH) and OH43.8-0.1 regions. Clearly, the VLA did not resolve all the maser spots. Higher resolution VLBA observations have been made in order to examine these regions in more detail.
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