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8.14. Magnetic fields in star-forming regions of our Galaxy

Published online by Cambridge University Press:  25 May 2016

B. Hutawarakorn  and
R. J. Cohen
B. Hutawarakorn
Affiliation:
NRAL, University of Manchester, Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, UK
R. J. Cohen
Affiliation:
NRAL, University of Manchester, Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, UK

Extract

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Masers provide a direct way of measuring magnetic fields in star-forming regions. OH ground-state masers at 18 cm wavelength exhibit strong circular polarization due to Zeeman splitting. The implied magnetic field strength is typically a few mG, which is sufficient for the field to be dynamically important, e.g. in channelling the observed bipolar outflows. Moreover there are indications that magnetic fields in maser regions are aligned with the large-scale Galactic magnetic field (Reid & Silverstein 1990), and that bipolar molecular outflows are also aligned with the local Galactic magnetic field (Cohen, Rowland & Blair 1984). Some theoretical work in fact suggests that the magnetic field is intimately connected with the origin of the molecular outflow (e.g. Pudritz & Norman 1983; Uchida & Shibata 1985). It is therefore important to investigate the magnetic field configuration in these regions in as much detail as possible.

Type
Part II. Nuclear Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 371 - 372
Copyright
Copyright © Kluwer 1998 

References

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