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リニューアルされたハッブル宇宙望遠鏡で超新星1987Aを観測
Kevin France1, Richard McCray, Kevin Heng
1Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309-0389, USA.
Science (New York, N.Y.)
|September 4, 2010
まとめ
ハッブル宇宙望遠鏡の観測により,超新星残骸1987A.で進化する天体物理ショックが明らかになりました. 放射線が明るくなり,速度が低下し,渦巻電磁場内の粒子の加速を示しています.
科学分野:
- 天体物理学 天体物理学
- スーパーノヴァの残骸
- プラズマ物理学 プラズマ物理学
背景:
- 超新星1987Aの残骸は,天体物理学的衝撃を研究するためのユニークな研究室を提供します.
- 長期観測は,衝撃の進化と粒子加速の理解に不可欠です.
研究 の 目的:
- 超新星残骸1987A.の衝撃放射線 (Lyα,Hα,Nv) の変化を分析する.
- 残骸の衝突のない衝撃の中で粒子の加速と分散を駆動する物理的メカニズムを調査する.
主な方法:
- ハッブル宇宙望遠鏡 (HST) の2004年と2010年のデータを活用して.
- Lyα,Hα,Nvの放射のスペクトルラインプロファイルと速度を比較する.
- 共振散乱と乱流の電磁場効果を分析する.
主要な成果:
- Lyα と Hα 放射線は明るさが増加しています.
- 衝撃放射の最大速度は低下しています.
- 広範囲で青色シフトしたLyαは共振散射に起因し,Nv線放射はLyαから赤色シフトで検出されました.
- 明確なNv線プロファイルは,イオンの散乱と,乱流の電磁場による加速を示唆しています.
結論:
- 超新星残骸1987Aにおける天体物理的衝撃は,速度が低下し,放射能が明るくなり,進化しています.
- 乱れた電磁場は,衝突のない衝撃の中でイオンの散乱と加速に重要な役割を果たします.
- 共振分散は,観測されたLyα放射パターンに寄与する.
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