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銀河系にある異常な質量の恒星ブラックホールです
J Greiner1, J G Cuby, M J McCaughrean
1Astrophysical Institute Potsdam, 14482 Potsdam, Germany. j.greiner@aip.de
Nature
|December 6, 2001
まとめ
研究者はマイクロクワザールGRS1915+105のブラックホールの質量を直接測定し,それが太陽の質量14倍であることを発見しました. この発見は,二重星系におけるジェット形成とブラックホールの進化の理解を助けます.
科学分野:
- 天体物理学 天体物理学
- 高エネルギー天体物理学
- X線天文学X線天文学とは
背景:
- マイクロクワザールは,超光速で物質を散発的に放出するバイナリ系です.
- GRS1915+105はマイクロクワザールで,最大回転のブラックホールを宿している可能性がある.
- 以前の間接的なX線データによると,ブラックホールの質量は太陽の10〜30の質量であった.
研究 の 目的:
- GRS1915+105.5の軌道周期と質量関数を直接測定するために
- GRS1915+105.5のブラックホールの質量を測定する.
- 二重星系におけるジェット形成とブラックホール形成を理解する.
主な方法:
- 軌道周期を直接測定する.
- X線データを用いて質量関数の決定.
- 軌道パラメータに基づいてブラックホールの質量の計算.
主要な成果:
- 直接的な測定により,ブラックホールの質量は,太陽の質量14 +/- 4 の質量となった.
- この質量は,二重星系 (>5〜7太陽質量) での従来のブラックホール形成モデルに異議を唱える.
- 質量推定は,エディントン限度付近の蓄積円盤の不安定性によるGRS1915+105のX線変動の解釈を支持する.
結論:
- GRS1915+105のブラックホールの直接質量測定は,マイクロクワザーを理解するための重要なデータを提供します.
- この発見は,ブラックホールのスピンとマイクロクワサールにおけるX線特性のモデルを制約する.
- この研究は,蓄積物理学とブラックホールの進化に関する私たちの知識を前進させます.
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