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巨大なブラックホールの形成は,密集した若い恒星群の衝突によって引き起こされる
Simon F Portegies Zwart1, Holger Baumgardt, Piet Hut
1Astronomical Institute Anton Pannekoek, and Institute for Computer Science, University of Amsterdam, Kruislaan 403, The Netherlands. spz@science.uva.nl
Nature
|April 16, 2004
まとめ
MGG11星団の巨大な恒星が合体し,中等質量ブラックホールを形成した. シミュレーションでは,この駆け抜けた衝突プロセスがブラックホールの原因を説明していることが示されています.
科学分野:
- 天体物理学 天体物理学
- 銀河の進化 銀河の進化 銀河の進化
- 星の動力学 星の動力学
背景:
- MGG11星団の明るいX線源は,中等質量ブラックホール (IMBH) を示唆している.
- MGG 11は,スターバースト銀河M 82に位置し,IMBHが欠けているMGG 9とは異なる.
研究 の 目的:
- 若い星群における中等質量ブラックホールの形成メカニズムを調査する.
- MGG 11とMGG 9のIMBH存在の違いを理解するために.
主な方法:
- 恒星の進化と星群内の動きの数値シミュレーション.
- 星の合併と動的摩擦効果をモデル化する.
主要な成果:
- ダイナミックな摩擦により,MGG 11の巨大な恒星が核に沈み,暴走的な衝突が始まる.
- この衝突により,超大質量恒星 (800~3000太陽質量) が形成され,その恒星はIMBHに崩壊します.
- MGG 9のより大きな半径は,より長い質量分離の時間スケールをもたらし,そのような駆け抜けた衝突を防ぐ.
結論:
- 密集した若い星団における脱走した恒星の衝突は,中間質量のブラックホールを形成することができます.
- クラスターのダイナミクス,特に質量分離の時間スケールは,IMBH形成に不可欠です.
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