ガンマ線爆発GRB 130427Aからの明るい光学フラッシュと後光は,GRB 130427Aからの明るい光学フラッシュと後光です
W T Vestrand1, J A Wren, A Panaitescu
1Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA.
Science (New York, N.Y.)
|November 23, 2013
まとめ
ガンマ線爆発 (GRB) からの明るい光学的閃光は,高エネルギーガンマ線放射と相関しています. これは,逆衝撃放射が早期のGRB後光を説明し,恒星の崩壊爆発の洞察を提供することを示唆しています.
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
- 観測宇宙論は観測による宇宙論である.
背景:
- ガンマ線爆発 (GRB) は,巨大な星の崩壊によって生じる強力な宇宙爆発です.
- 光学とガンマ線の同時放出は,GRBの物理学の重要な洞察を提供します.
- GRBの祖先システムと放射機構を理解することは,天体物理学における重要な目標です.
研究 の 目的:
- GRB 130427A.からの光学閃光とガンマ線放射の関係について調査する.
- 観測された光学信号とガンマ線信号を発生させる放射機構を決定する.
- GRBからの高エネルギーガンマ線放射を研究するための最適な条件を特定する.
主な方法:
- GRB 130427A.からの光学フラッシュと後照明の観測.
- 光学流と>100 MeVのガンマ線流の間の時間的な相関の分析.
- 相対論的な射出物における衝撃放出プロセス (逆転と前向きの衝撃) のモデリング.
主要な成果:
- 最初の7000秒で光学と>100 MeVのガンマ線流の間の強い相関が観察されました.
- この相関は,相対論的なエジェクタが周囲の物質にぶつかったときの逆衝撃放射によって最もよく説明されます.
- 後の光学放射は,サーキュンバースト環境を通して広がる前方ショックに起因した.
結論:
- この研究は,光学的後照明と100 MeV以上のガンマ線放射を関連付け,衝撃モデルを裏付けている.
- 近くの,初期のピークの光学後光は,ギガエレクトロンボルトからテラエレクトロンボルトのガンマ線放射を研究するための主要な標的として特定されています.
- この研究は,ガンマ線爆発とその関連現象を支配する物理学の理解を深める.
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