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Magnetic fields in our Galaxy on large and small scales

Published online by Cambridge University Press:  01 March 2007

J. L. Han
J. L. Han*
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences Jia-20 DaTun Road, Chaoyang District, Beijing 100012, China email: [email protected]
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Abstract

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Magnetic fields have been observed on all scales in our Galaxy, from AU to kpc. With pulsar dispersion measures and rotation measures, we can directly measure the magnetic fields in a very large region of the Galactic disk. The results show that the large-scale magnetic fields are aligned with the spiral arms but reverse their directions many times from the innermost arm (Norma) to the outer arm (Perseus). The Zeeman splitting measurements of masers in HII regions or star-formation regions not only show the structured fields inside clouds, but also have a clear pattern in the global Galactic distribution of all measured clouds which indicates the possible connection of the large-scale and small-scale magnetic fields.

Keywords

ISM: magnetic fieldspulsars: generalHII regionsradio lines:ISMISM: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 55 - 63
Copyright
Copyright © International Astronomical Union 2008

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