High resolution magnetic field measurements in high-mass star-forming regions using masers
Abstract
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.
- Publication:
-
Cosmic Masers - from OH to H0
- Pub Date:
- July 2012
- DOI:
- 10.1017/S1743921312006667
- Bibcode:
- 2012IAUS..287...69S
- Keywords:
-
- Stars:formation;
- masers:methanol;
- polarization