Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-03-19
Astrophys.J.702:L23-L26,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
1 table
Scientific paper
10.1088/0004-637X/702/1/L23
The effect of magnetic fields on the frequencies of toroidal oscillations of neutron stars is derived to lowest order. Interpreting the fine structure in the QPO power spectrum of magnetars following giant flares reported by Strohmayer and Watts (2006) to be "Zeeman splitting" of degenerate toroidal modes, we estimate a crustal magnetic field of order 10^{15} Gauss or more. We suggest that residual m, -m symmetry following such splitting might allow beating of individual frequency components that is slow enough to be observed.
Eichler David
Shaisultanov Rashid
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