M 31にある超輝かしい恒星質量マイクロクワザールから発せられた明るい電波放射
Matthew J Middleton1, James C A Miller-Jones, Sera Markoff
1Physics Department, University of Durham, Durham DH1 3LE, UK. m.j.middleton@durham.ac.uk
Nature
|December 14, 2012
まとめ
私たちはM31で新しい超光るX線源を発見し,急速な無線変動を示しています. これは,コンパクトで恒星質量のあるブラックホールがエディントン限界に近づき,相対論ジェットに電力を供給していることを示唆している.
科学分野:
- * 天体物理学
- * 高エネルギー天体物理学
- *ブラックホールの蓄積物理学
背景:
- *超光るX線源 (ULXs) は,光度が10^39 erg/sを超える天文物である.
- *ULXのサブセットは,恒星質量ブラックホール (太陽質量5~20倍) への蓄積によって動いている.
- *相対論ジェットは銀河の源で観測され,エディントン限度付近の蓄積と関連しているが,星間吸収により発射メカニズムは不明である.
研究 の 目的:
- * M 31銀河で新たに発見されたX線源を調査する.
- * この源の性質と蓄積性質を決定する.
- * 銀河外ULXにおける蓄積フローとジェット放射の関係を探求する.
主な方法:
- * M 31のX線源の同時無線とX線観測.
- *X線光度と電波放射特性の分析.
- * 短時間スケールでの無線変動の時間分析.
主要な成果:
- *M31の新たなX線源が,ピーク光度>10^39 erg/sで検出されました.
- *非常に高い放射光度が観測されました.
- * 数十分間の時間スケールでの有意な無線変動.
結論:
- * 源はコンパクトで,恒星質量のブラックホールへの蓄積によって動いています.
- * 収縮率はエディントン限界に近い.
- *さらなるモニタリングにより,蓄積とジェットエジェクションの因果関係が明らかになる.
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