On the origin of the high-Q high-frequency oscillations of magnetars

Details On the origin of the high-Q high-frequency oscillations of magnetars On the origin of the high-Q high-frequency oscillations of magnetars

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astl...37..276s&link_type=abstract

Astronomy Letters, Volume 37, Issue 4, pp.276-280

Astronomy and Astrophysics

Astronomy

Magnetars, Quasi-Periodic Oscillations, Coronal Loops

Scientific paper

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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