On the nature of quasi-periodic oscillations in the tail of soft gamma repeater giant flares

A. N. Timokhin, D. Eichler, Yu Lyubarsky

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

A model is presented for the quasi-periodic component of magnetar emission during the tail phase of giant flares. The model invokes modulation of the particle number density in the magnetosphere. The magneto spheric currents are modulated by torsional motion of the surface, and we calculate that the amplitude of neutron star (NS) surface oscillation should be ∼1% of the NS radius in order to produce the observed features in the power spectrum. Using an axisymmetric analytical model for structure of the magnetosphere of an oscillating NS, we calculate the angular distribution of the optical depth to the resonant Compton scattering. The anisotropy of the optical depth may be why quasi-periodic oscillations are observed only at particular rotational phases.

Original languageEnglish
Pages (from-to)1398-1404
Number of pages7
JournalAstrophysical Journal
Volume680
Issue number2
DOIs
StatePublished - 20 Jun 2008

Keywords

  • Stars: magnetic fields
  • Stars: neutron
  • Stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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