On the excitation of f modes and torsional modes by magnetar giant flares
Abstract
Magnetar giant flares may excite vibrational modes of neutron stars. Here we compute an estimate of initial post-flare amplitudes both of 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 ∼1015 G, the gravitational wave detection of these f modes with Advanced LIGO is unlikely.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 2011
- DOI:
- 10.1111/j.1365-2966.2011.19515.x
- arXiv:
- arXiv:1103.0880
- Bibcode:
- 2011MNRAS.418..659L
- Keywords:
-
- stars: neutron;
- Astrophysics - High Energy Astrophysical Phenomena;
- General Relativity and Quantum Cosmology
- E-Print:
- submitted to MNRAS