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High resolution magnetic field measurements in high-mass star-forming regions using masers

Published online by Cambridge University Press:  24 July 2012

Gabriele Surcis ,
Wouter H. T. Vlemmings ,
Huib J. van Langevelde  and
Busaba Hutawarakorn Kramer
Gabriele Surcis
Affiliation:
Joint Institute for VLBI in EuropePostbus 2, 7990AA, Dwingeloo, the Netherlands email: surcis@jive.nl
Wouter H. T. Vlemmings
Affiliation:
Chalmers University of Technology, Onsala Space ObservatorySE-439 92Onsala, Sweden email: wouter.vlemmings@chalmers.se
Huib J. van Langevelde
Affiliation:
Joint Institute for VLBI in EuropePostbus 2, 7990AA, Dwingeloo, the Netherlands email: surcis@jive.nl Sterrewacht Leiden, Leiden UniversityPostbus 9513, 2300RA Leiden, the Netherlands email: langevelde@jive.nl
Busaba Hutawarakorn Kramer
Affiliation:
Max-Planck Institut für RadioastronomieAuf dem Hügel 69, 53121 Bonn, Germany email: bkramer@mpifr-bonn.mpg.de
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Abstract

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The bright and narrow spectral line emission of masers is ideal for measuring the Zeeman-splitting as well as for determining the orientation of magnetic fields in 3-dimensions around massive protostars. Recently, polarization observations at milliarcsecond resolution of 6.7-GHz CH3OH masers have uniquely been able to resolve the morphology of magnetic fields close to massive protostars. The observations reveal that the magnetic fields are along outflows and/or on the surfaces of circumstellar tori. Here we present three different examples selected from a total number of 7 massive star-forming regions that were investigated at 6.7-GHz with the EVN in the last years.

Keywords

Stars:formationmasers:methanolpolarization
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 69 - 73
Copyright
Copyright © International Astronomical Union 2012

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