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マグネタールSGR 1806-20からの巨大なフレアによって生成された膨張するラジオ星雲
B M Gaensler1, C Kouveliotou, J D Gelfand
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA. bgaensler@cfa.harvard.edu
Nature
|April 29, 2005
まとめ
マグネタール (SGR 1806-20) からの巨大なフレアは,強力な無線後光を生成しました. 光速に近い速さで膨張しているこの星雲は,マグネタール爆発による膨大なエネルギー放出を示しています.
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
- 中性子星物理学 中性子星物理学
背景:
- ソフトガンマ線リピーター (SGR) は,極限磁場 (~10^15ガウス) を有する磁星,中性子星である.
- 巨大なフレアは,磁星からの希少で強力な爆発であり,これまで2回の無線後照明検出しかありませんでした.
研究 の 目的:
- マグネタールSGR 1806-20の2004年の巨大なフレアからの無線後照明の検出と特性を報告する.
- マグネタール巨大なフレアに関連したエネルギー出力と物理的プロセスを調査する.
主な方法:
- SGR 1806-20の巨大フレアをフォローする様々な機器を使用して,無線放射の検出.
- ラジオアフターグローの空間構造,極化,膨張のダイナミクスの分析.
- 観測されたアフターグローの特性に基づいて放出されたエネルギーの推定.
主要な成果:
- フレア後の6日目から19日目まで,色あせ,解消され,線形偏振の電波星雲が観測されました.
- ラジオ星雲は,光の速度の約25%で膨張していた.
- 観測されたアフターグローの明るさは,以前に検出された同様の源の500倍でした.
- 少なくとも4×10^43のエルグが磁場と相対論粒子で放出され,星雲を形成した.
結論:
- 磁石の巨大なフレアは,明るく,急速に膨張する無線星雲を生成することができます.
- これらの出来事は,磁場や相対性粒子という形で,かなりのエネルギーを放出します.
- 観測されたラジオの余光は,マグネタール爆発の物理学の重要な洞察を提供します.
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