ブラックホールの低質量X線バイナリV404 Cygniは,広い三重の部分です
Kevin B Burdge1,2, Kareem El-Badry3, Erin Kara4,5
1Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA. kburdge@mit.edu.
Nature
|October 24, 2024
まとめ
ブラックホールの形成は最小限の
科学分野:
- 天文学と天体物理学
- 星の進化について
- コンパクトオブジェクト
背景:
- ブラックホールや中性子星のような コンパクトな物体は 形成過程で"誕生キック"を受け 勢いを増す可能性があります
- ニュートロン星のキックには 十分な観測証拠があるが ブラックホールの誕生キックの証拠は限られている.
- ブラックホールの形成のシナリオは とても小さな誕生キックを予測します
研究 の 目的:
- 低質量X線バイナリ (LMXB) V404 Cygniを用いてブラックホールの誕生キックを調査する.
- ブラックホールが誕生時に 形成されるかどうか調べるため
- LMXBの進化における階層的な三重システムの役割を調べる.
主な方法:
- V404 Cygniシステムの軌道構成の分析,階層的なトリプル.
- ブラックホールの重力作用を モデル化しています
- ブラックホールの誕生キックを システムの安定性に基づいて 推定する
主要な成果:
- V404 Cygniは,少なくとも3,500AUの距離にある第三級の伴星を持つ階層的な三重システムです.
- V404 Cygniのブラックホールは,第3次伴星を解き放つのを避けるために,おそらく5km/s未満の誕生キックを受けた.
- 三次元の伴星は進化しており 3~5億年前に形成されたことを示している.
結論:
- この発見は 少なくとも一部のブラックホールは 軽微な誕生キックで 形成されるという仮説を裏付けています
- V404 Cygniの階層的な三重構造は,LMXBの進化モデルを検証しています.
- ブラックホールは,少なくとも 太陽の質量の半分を 副伴星から数十億年にわたって 蓄積しています
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