Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chee.conf..334b&link_type=abstract
CURRENT HIGH-ENERGY EMISSION AROUND BLACK HOLES . Proceedings of the 2nd KIAS Astrophysics Workshop. Held 3-8 September 2001 in
Astronomy and Astrophysics
Astrophysics
4
Pulsars, Magnetars, Non-Radial Torsional Pulsations
Scientific paper
We examine hypothesis that long-periodic pulsed emission of soft gamma repeaters (SGR's) in the quiescent regime of their radiation owe its origin to magneto-mechanical pulsations of magnetar triggered by gamma-bursting starquake. Two alternative models are discussed for a neutron star undergoing global differentially-rotational pulsations in the regime of strong coupling between mechanical displacements of nuclear material and seed magnetic field inherited by neutron star from its massive progenitor. First is the single-component magneto-hydrodynamic (MHD) model and second is magneto-elastodynamic (MED) model presuming permanent magnetization of neutron star matter. Based on the energy variational principle analytic estimates for periods of non-radial torsional MHD and MED modes are derived. Numerically we found that periods of MED mode fall into the realm of periods of pulsed emission of magnetars. This correspondence is interpreted as an indirect evidence that detected γ-pulses are caused by differentially-rotational vibrations of permanently magnetized neutron star in which self-gravity has been brought to equilibrium by degenerate nuclear matter in the state of paramagnetic saturation promoted by Pauli mechanism of alignment of spin magnetic moments of neutrons along the seed magnetic field.
Bastrukov Sergey
Kim Miyoung
Podgainy Dmitry
Yang Jongmann
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