On the origin of the high-Q high-frequency oscillations of magnetars |
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| Authors: | A V Stepanov V V Zaitsev E Valtaoja |
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| Institution: | (1) Physics Department and Columbia Astrophysics Laboratory, Columbia University, 538 W 120th Street, New York, USA;(2) Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, Canada |
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| Abstract: | A model for the high-frequency (20–2400 Hz) quasi-periodic oscillations (QPOs) of magnetars based on the representation of
coronal magnetic loops as equivalent electric RLC circuits is proposed. The observed periods of the QPOs and their high Q-factor (Q ≈ 104–105) are explained. It follows from the model that the QPOs can be excited not only in the tail of a flare but also before the
main pulse. The parameters of the QPO source at the “ringing tail” stage of the flare from SGR 1806–20 on December 27, 2004,
have been estimated: electric current I ≈ 3 × 1019 A, minimum magnetic field strength B
min ≈ 1013 G, and electron density n ≈ 2 × 1016 cm−3. |
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