Quasi-Periodic Oscillations in magnetars: linking variability and emission
Abstract
I present recent results studying flare emission in magnetars. Strong quasi-periodic oscillations observed in the tail of giant magnetar flares are frequently interpreted as evidence for global seismic oscillations. I demonstrate that such a global oscillation is not directly observable in the lightcurve. New work suggests the amplitude for the strongest QPO stays nearly constant in the rotation phases where it is observed, which I argue suggests it is produced by an additional emission process from the star.
- Publication:
-
Neutron Stars and Pulsars: Challenges and Opportunities after 80 years
- Pub Date:
- March 2013
- DOI:
- 10.1017/S1743921312023460
- arXiv:
- arXiv:1210.6480
- Bibcode:
- 2013IAUS..291..155D
- Keywords:
-
- dense matter;
- radiation mechanisms: general;
- magnetic fields (magnetohydrodynamics:) MHD;
- stars: neutron;
- stars: oscillations;
- X-rays: stars;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Proceedings of IAUS 291 "Neutron Stars and Pulsars: Challenges and Opportunities after 80 years", J. van Leeuwen (ed.)