コンパクトな物体 の 合併 から 生じる 近く の 長い ガンマ 射線 の 爆発
E Troja1,2, C L Fryer3, B O'Connor4,5,6,7
1Department of Physics, University of Rome "Tor Vergata", Rome, Italy. eleonora.troja@uniroma2.it.
Nature
|December 8, 2022
まとめ
科学者たちは,非常に明るいガンマ線爆発 (GRB) 211211Aを観測し,それをハイブリッドイベントとして分類しました. この近くのイベントは,コンパクトなオブジェクトの合併から生じた明るいキロノヴァの強力な証拠を提供します.
科学分野:
- 天体物理学
- 宇宙の爆発
- 高エネルギー天文学
背景:
- ガンマ線爆発は エネルギーに満ちた宇宙の爆発です
- 長いGRBは巨大な星の核の崩壊から生じる. 短いGRBはコンパクトなオブジェクトの合併から生じる.
- GRBのハイブリッドクラスは存在しますが,確認された祖先がありません.
研究 の 目的:
- ハイブリッドガンマ線爆発 (GRB) の原始を調査する.
- ハイブリッドGRBの祖先の 直接的なシグネチャーを探す
- GRB 211211Aの低エネルギー相場を特徴づけるために
主な方法:
- 極めて明るいGRB 211211Aの観測
- ハイブリッドGRBとして事件の分類
- 距離スケールの決定は 346 メガパーセック.
- 低エネルギー (紫外線から近赤外線) の同位体の分析
主要な成果:
- GRB 211211Aはハイブリッドイベントとして分類されています.
- イベントの接近 (346 Mpc) は,敏感な観測を可能にします.
- 光を発するキロノヴァ (約. 10^42 erg/s) が検出されました.
- キロノバは,コンパクトなオブジェクトの合併のエジェクトで形成される可能性があります.
結論:
- ハイブリッドGRBは,コンパクトなオブジェクトの合併から発生します.
- キロノバは コンパクトなオブジェクトの 合併のサインです
- GRB 211211Aは,ハイブリッドGRBと中性子星の合併を結びつける強力な証拠を提供します.
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