Global 3D MHD Simulations of Optically Thin Black Hole Accretion Disks(Session 4 : Theoretical/Numerial Approaches to the Accretion Physics)
スポンサーリンク
概要
- 論文の詳細を見る
We present the results of global three-dimensional resistive magnetohydrodynamic simulations of optically thin accretion disks around a black hole. General relativistic effects are simulated by using the pseudo-Newtonian potential. Initial state is a rotating torus threaded by weak toroidal magnetic fields. We assume an anomalous resistivity enhanced in localized current sheets. After several rotation time of the torus, the torus deforms itself into an accretion disk. Numerical results indicate that small-scale magnetic reconnections taking place in the turbulent disk produces 1/f-like X-ray fluctuations. When dense blobs infall, since they stretch and twist magnetic field lines, bisymmetric spiral magnetic channels are created in the innermost plunging region of the disk. Magnetic reconnection taking place inside the channel can be the origin of X-ray shots observed in black hole candidates. We also present the results of simulations including the radiative cooling in optically thin disks. When mass accretion rate exceeds a critical accretion rate, the outer regions of the hot accretion disk (r > 10r_g, where r_g is the Schwarzschild radius) make transition to geometrically thin, cool disk. Since the toroidal magnetic flux is conserved while the disk shrinks in vertical direction, magnetic pressure becomes dominant inside the disk. We expect violent magnetic activities in such magnetic pressure dominated disk.
- 理論物理学刊行会の論文
- 2004-11-15
著者
-
松元 亮治
千葉大理
-
Matsumoto R
Department Of Physics Chiba University
-
Matsumoto Ryoji
Department Of Physics Graduate School Of Science Chiba University
-
Matsumoto Ryoji
Faculty Of Science Chiba University
-
Matsumoto Ryoji
Chiba Univ. Chiba
-
Matsumoto Ryoji
Department Of Citrus Research National Institute Of Fruit Tree Science
-
MACHIDA Mami
Division of Theoretical Astronomy, National Astronomical Observatory of Japan
-
松元 亮治
千葉大学理学部物理学科
-
Nakamura Kenji
Department of Surgery, Tokai University School of Medicine
-
Machida M
Division Of Theoretical Astronomy National Astronomical Observatory
-
Machida Mami
Department Of Physics Chiba University
-
Machida Mami
Division Of Theoretical Astronomy National Astronomical Observatory Of Japan
-
Nakamura Kenji
Department Of Anatomy Graduate School Of Medicine Osaka City University
関連論文
- 26pYF-1 ブラックホール降着円盤における時間変動とアウトフロー形成の磁気流体シミュレーション(プラズマ宇宙物理(相対論的宇宙プラズマ),領域2,プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理)
- Self-Gravitational Instability of an Isothermal Gaseous Slab under High External Pressure
- Discovery of Molecular Loop 3 in the Galactic Center : Evidence for a Positive-Velocity Magnetically Floated Loop towards L=355°-359°
- Similarity between the Molecular Loops in the Galactic Center and the Solar Chromospheric Arch Filaments
- 24pQB-11 相対論的磁気アーケードの膨張と粒子加速(24pQB プラズマ宇宙物理,領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))
- 29pXB-7 総合パネル討論(29pXB 領域2シンポジウム:現代プラズマ科学の最前線〜学際連携によるプラズマ理工学のさらなる展開,領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))
- Asian Winter School on Numerical Astrophysics 開催について
- 27aSA-2 超並列計算機による天体活動現象の輻射磁気流体シミュレーション(27aSA プラズマ宇宙物理(シミュレーション技法),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))
- 27aSA-1 大規模プラズマシミュレーションの課題(27aSA プラズマ宇宙物理(シミュレーション技法),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))
- 銀河系中心部分子雲ループの磁気流体シミュレーション