奇妙な起源を持つ長時間ガンマ線爆発
Jun Yang1,2, Shunke Ai3,4, Bin-Bin Zhang5,6
1School of Astronomy and Space Science, Nanjing University, Nanjing, China.
Nature
|December 8, 2022
まとめ
特殊な長時間のガンマ線爆発 (GRB) は新しい起源を示唆しています 観測は白矮星と中性子星の融合を示し,以前のGRB分類に異議を唱え,新しい祖先を明らかにしました.
科学分野:
- 天体物理学と宇宙学
- 高エネルギー天体物理学
- コンパクトオブジェクトの合併
背景:
- 長いガンマ線爆発 (GRB) は通常,巨大な恒星の核の崩壊と関連しています.
- 短期的なGRBは,一般的にコンパクトな二重星の合併と関連しています.
- 新興の証拠は"変な"GRBは,単純に持続時間に基づく分類に挑戦し,複数の基準の分析を必要とすることを示唆しています.
研究 の 目的:
- 特殊な長時間ガンマ線爆発 GRB 211211Aを物理的に分類する
- GRB 211211Aの祖先と放出メカニズムを調査する
- ガンマ線爆発の原始種を探るためだ
主な方法:
- GRB 211211Aの即時放出特性の分析
- 多帯域観測 (光学および近赤外線) で,過剰な放射を検出する.
- 既知のガンマ線爆発型 (タイプI) と関連する現象 (キロノヴァ) との比較.
主要な成果:
- GRB 211211Aは,既知のタイプI GRBとは異なる即時放出特性を有しています.
- キロノヴァの放射に似た 光学および近赤外線での 過剰放射が検出されました
- これらの観測は,GRB 211211Aの非巨大星の起源を示唆しています.
結論:
- GRB 211211Aの特徴は 典型的な巨大な恒星の核崩壊と矛盾しています
- 白い矮星とニュートロン星の合併のシナリオは,合併後のマグネタールエンジンで,自己一貫した説明を提供します.
- これはガンマ線爆発の 新しい祖先の経路を示唆し コンパクトなオブジェクトの 融合に関する理解を広げています
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