Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..968..165h&link_type=abstract
ASTROPHYSICS OF COMPACT OBJECTS: International Conference on Astrophysics of Compact Objects. AIP Conference Proceedings, Volum
Astronomy and Astrophysics
Astrophysics
1
Pulsars, Spiral Arms And Galactic Disk, Electric And Magnetic Fields, Velocity, Acceleration, And Rotation
Scientific paper
There are several kinds of probes for the Galactic magnetic fields. Among them, pulsars are the best. In the Galactic disk, from the rotation measures (RMs) of a large number of newly discovered pulsars, the large-scale magnetic fields along the spiral arms have been delineated in a much larger region than ever before, with alternating directions in the arm and interarm regions. The RM data of extragalactic radio sources are consistent with such magnetic field directions in the tangential regions. The strength of large-scale fields obtained from pulsar RM data has been found to increase exponentially towards the Galactic center. Since pulsar RMs are an integration of electron density and magnetic fields along the lines of sight from pulsars to us, which contain the information of magnetic field fluctuation on different scales for pulsars with different distances. We derived the spatial magnetic field energy spectrum from pulsar RM data, which shows a shallow broken spectrum compared to the steep Kolmogorov spectrum of magnetic energy at small scales.
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