Hydromagnetic Instabilities in Neutron Stars

Autor:	Lasky, Paul D., Zink, Burkhard, Kokkotas, Kostas D., Glampedakis, Kostas
Rok vydání:	2011
Předmět:	Astrophysics - Solar and Stellar Astrophysics General Relativity and Quantum Cosmology
Zdroj:	2011 ApJ 735, L20
Druh dokumentu:	Working Paper
DOI:	10.1088/2041-8205/735/1/L20
Popis:	We model the non-linear ideal magnetohydrodynamics of poloidal magnetic fields in neutron stars in general relativity assuming a polytropic equation of state. We identify familiar hydromagnetic modes, in particular the 'sausage/varicose' mode and 'kink' instability inherent to poloidal magnetic fields. The evolution is dominated by the kink instability, which causes a cataclysmic reconfiguration of the magnetic field. The system subsequently evolves to new, non-axisymmetric, quasi-equilibrium end-states. The existence of this branch of stable quasi-equilibria may have consequences for magnetar physics, including flare generation mechanisms and interpretations of quasi-periodic oscillations. Comment: Accepted for publication in ApJL. Movies of the simulations can be seen at http://www.tat.physik.uni-tuebingen.de/~tat/grmhd/
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1105.1895 Zobrazit plný text záznamu View this record from Arxiv