Special relativistic magnetohydrodynamic simulation of two-component outflow powered by magnetic explosion on compact stars

Jin Matsumoto, Youhei Masada, Eiji Asano, Kazunari Shibata

研究成果: Conference contribution

抄録

The nonlinear dynamics of the outflow driven by magnetic explosion on the surface of compact object is investigated through special relativistic magnetohydrodynamic simulations. We adopt, as an initial equilibrium state, a spherical stellar object embedded in the hydrostatic plasma which has a density ρ(r) α r-alpha; and is threaded by a dipole magnetic field. The injection of magnetic energy at the surface of compact star breaks the dynamical equilibrium and triggers two-component outflow. At the early evolutionary stage, the magnetic pressure increases rapidly in time around the stellar surface, initiating a magnetically driven outflow. Then it excites a strong forward shock, shock driven outflow. The expansion velocity of the magnetically driven outflow is characterized by the Alfvén velocity on the stellar surface, and follows a simple scaling relation νmag α νA1/2. When the initial density profile declines steeply with radius, the strong shock is accelerated self-similarly to relativistic velocity ahead of the magnetically driven component. We find that the evolution of the strong forward shock can be described by a self-similar relation Γsh α rsh, where Γsh is the Lorentz factor of the plasma measured at the shock surface rsh. It should be stressed that the pure hydrodynamic process is responsible for the acceleration of the shock driven outflow. Our two-component outflow model, which is the natural outcome of the magnetic explosion, would deepen the understanding of the magnetic active phenomena on various magnetized stellar objects.

本文言語English
ホスト出版物のタイトルAdvances in Plasma Astrophysics
編集者Alfio Bonanno, Elisabete de Gouveia Dal Pino, Alexander Kosovichev
ページ220-223
ページ数4
S274
DOI
出版ステータスPublished - 2010 9
外部発表はい

出版物シリーズ

名前Proceedings of the International Astronomical Union
番号S274
6
ISSN(印刷版)1743-9213
ISSN(電子版)1743-9221

ASJC Scopus subject areas

  • 医学(その他)
  • 天文学と天体物理学
  • 栄養および糖尿病
  • 公衆衛生学、環境および労働衛生
  • 宇宙惑星科学

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