On the excitation of f-modes and torsional modes by magnetar giant flares

Details On the excitation of f-modes and torsional modes by magnetar giant flares On the excitation of f-modes and torsional modes by magnetar giant flares

2011-03-04

arxiv.org/abs/1103.0880v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

submitted to MNRAS

Scientific paper

Magnetar giant flares may excite vibrational modes of neutron stars. Here we compute an estimate of initial post-flare amplitudes of both the torsional modes in the magnetar's crust and of the global f-modes. We show that while the torsional crustal modes can be strongly excited, only a small fraction of the flare's energy is converted directly into the lowest-order f-modes. For a conventional model of a magnetar, with the external magnetic field of about 10^{15} Gauss, the gravitational-wave detection of these f-modes with advanced LIGO is unlikely.

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