ホットプラズマとブラックホールのバイナリは,スターバースト銀河M82にある
R E Griffiths1, A Ptak, E D Feigelson
1Department of Physics, Wean Hall, Carnegie Mellon University, Pittsburgh, PA 15213-3890, USA. griffith@astro.phys.cmu.edu
まとめ
チャンドラX線天文台のデータによると,メシア82 (M82) は超新星によって駆動され,銀河の風を動かす非常に熱いプラズマを持っている. この研究は,コンパクトなX線源を特定し,潜在的にブラックホールシステムである.
科学分野:
- * 天体物理学
- * 高エネルギー天体物理学
- *銀河の進化について
背景:
- * Messier 82 (M82) は,恒星爆発銀河の原型であり,激しい恒星形成で知られています.
- * 銀河系における星間介質 (ISM) は,通常,1~200万ケルビンである.
- * 超新星爆発は銀河系現象の主要な原動力である.
研究 の 目的:
- * 高解像度のX線観測を用いて,M82の熱プラズマとエネルギー過程を調査する.
- * M82の核中のプラズマの温度と分布を特徴付けるため.
- * M82.2内のコンパクトなX線源を特定し,分析する.
主な方法:
- *チャンドラX線天文台にある先進的なCCD画像スペクトロメーターを利用した.
- *M82.2の高解像度X線観測を行った.
- * 分析されたスペクトルデータを用いて,プラズマ温度とX線源を特定した.
主要な成果:
- * 約40,000,000ケルビンの温度を持つプラズマが発見され,M82.8の内部の1キロパルセックを満たしている.
- * このプラズマは,天の川のISMよりもかなり熱い.
- *約20のコンパクトなX線源が解明され,その多くはブラックホールを含む可能性のある高質量X線バイナリーであると疑われています.
- * 中央部が過圧状態で,M82の銀河風を駆動していることが判明した.
結論:
- * M82の核における超新星爆発は,極めて高温で高圧のプラズマを生成する.
- * このプラズマは,銀河間媒介に広がる強力な銀河風の燃料となります.
- * M82には多数のコンパクトなX線源があり,ブラックホール候補を含む活発な高質量X線バイナリ集団を示しています.
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