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恒星質量ブラックホール系V404 Cygniの急激に変化するジェット方向
James C A Miller-Jones1, Alexandra J Tetarenko2,3, Gregory R Sivakoff2
1International Centre for Radio Astronomy Research-Curtin University, Perth, Western Australia, Australia. james.miller-jones@curtin.edu.au.
Nature
|May 1, 2019
まとめ
V404 Cygniで観測された,急激に変化する相対論ジェット. このジェット・プレセーションは,ブラックホールのフィードバックに影響を与える,薄い蓄積円盤におけるレンズ・ティリング効果と関連している.
科学分野:
- 天体物理学
- ブラックホール物理学
- アクレションディスクダイナミクス
背景:
- 集積するブラックホールは 強力な相対論ジェットを発射し 周囲に運動的フィードバックを与えます
- ジェットダイナミクスは,星質のブラックホールにおけるフレームの引きずりによるプレセッションの証拠とともに,蓄積流によって影響を受けます.
- 理論的なモデルは,ジェットがトルク増量フローを示唆しているが,増量ダイナミクスとジェット発射の相互作用は不明である.
研究 の 目的:
- ブラックホールのX線バイナリV404 Cygniの ジェット方向の急速な変化を調査するために
- 積層円盤動力学と相対論的ジェット運動の関係を理解する.
- ジェット機の打ち上げや方向転換における レンズ・ティリング・プレセッションの役割を調査する.
主な方法:
- V404 Cygniの2015年の爆発のピークを観測するために,非常に長いベースライン干渉計 (VLBI) を利用しました.
- 数分から数時間のスケールで ジェット方向の急速な変化を分析した.
- レンズ-ティリング効果を用いて観測されたジェットプレセッションをモデル化した.
主要な成果:
- V404 Cygniの相対論ジェット方向が 瞬く間に変化する
- 垂直に伸びた細い円盤のレンズ・ティリング前列として,この変化するジェット方向を成功裏にモデル化しました.
- 超エディントンの蓄積率が 細い円盤の形成の原因と判明した.
結論:
- 数百の重力半径内でのジェット発射や再誘導に 重要な役割を果たします
- このプレセーションメカニズムは,スピンが不整い,入気ガスが強いブラックホールで予想されます.
- このようなダイナミクスはジェット観測特性に影響を与え,ブラックホールのフィードバック分布を均一にする.
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