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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
異例のG-ray burst GRB 101225Aは,ヘリウム星/中性子星が赤道偏移0.33で合体したことから発生した
C C Thöne1, A de Ugarte Postigo, C L Fryer
1IAA - CSIC, Glorieta de la Astronomía s/n, 18008 Granada, Spain. cthoene@iaa.es
Nature
|December 2, 2011
まとめ
異常な長いガンマ線爆発 (GRB) 101225Aは,熱X線トランジタと光学超新星に続く長寿の放射を示した. ヘリウム星と中性子星の融合が原始イベントとして提案されている.
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
- 恒星の進化について
背景:
- 長いガンマ線爆発 (GRB) は,巨大な恒星の死と超新星に関連しています.
- GRBには,シンクロトロン放射を介して非熱的放射を生成する超相対性ジェットが含まれています.
- GRBの祖先と放出メカニズムを理解することは,天体物理学にとって極めて重要です.
研究 の 目的:
- 長いガンマ線爆発GRB 101225A.のユニークな特性を分析するために.
- この異常なGRBイベントの放出メカニズムと祖先を調査するために.
- GRB 101225Aの赤偏移と宿主銀河の性質を決定する.
主な方法:
- GRB 101225Aのガンマ線,X線,光学放射の観測と分析.
- 光スペクトルエネルギー分布と光の曲線をGRB超新星テンプレートでフィッティングして赤道移転を推定します.
- 放射を膨張し,冷却するブラックボディとそれに続く超新星としてモデル化.
主要な成果:
- GRB 101225Aは,例外的に長寿のガンマ線放射を示した.
- 熱い熱コンポーネントと異常な光学コントローラを持つ明るいX線トランジタが観察されました.
- 光学放射は,冷却するブラックボディとして進化し,その後に微弱な超新星成分があり,推定赤偏差はz = 0.33.3と推定されています.
結論:
- 提案された祖先は,ヘリウム星と中性子星の融合であり,噴出物質によって熱化されたGRBのようなジェットにつながります.
- 代替的な説明は,銀河の中性子星に小さな天体が集積することを含む.
- 観測された現象は,従来のGRBモデルに異議を唱え,さまざまな祖先シナリオを示唆しています.
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