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Magnetic field evolution in magnetars and its implication to accreting system

Published online by Cambridge University Press:  21 February 2013

Yasufumi Kojima
Yasufumi Kojima*
Affiliation:
Department of Physics, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan email: kojima@theo.phys.sci.hiroshima-u.ac.jp
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Abstract

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The evolution of magnetic field is numerically studied for an isolated magnetar, assuming vacuum exterior. Nonlinear coupling between poloidal and toroidal components of the magnetic field can be seen in the initial Hall-drift timescale. Consequently, the polar field at the surface is highly distorted during the phase. This result is suggestive. Fixed dipole magnetic field has been used so far in the theoretical study of the interaction between magnetosphere and accreting matter. In the accretion to magnetar, time-dependent polar magnetic field should be taken into account.

Keywords

magnetic fieldsstars: neutron
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 235 - 236
Copyright
Copyright © International Astronomical Union 2013

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