短いガンマ線爆発GRB 050709の光学的な後光は,GRB 050709の光学的な後光である
Jens Hjorth1, Darach Watson, Johan P U Fynbo
1Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej, DK-2100 Copenhagen Ø, Denmark. jens@astro.ku.dk
Nature
|October 7, 2005
まとめ
研究者らは,短いガンマ線爆発 (GRB) の最初の光学後光発見を報告した. GRB 050709のこの発見は,短いGRBは,超新星に関連している長いGRBとは異なる起源を持つ可能性があることを示唆しています.
科学分野:
- 天文学と天体物理学について
- 高エネルギー天体物理学 高エネルギー天体物理学
背景:
- ガンマ線爆発 (GRB) は,放射時間に基づいて長時間 (>2秒) と短時間 (<2秒) に分類される.
- 長期にわたるGRBは,Ic型超新星と関連していると考えられ,そのX線と光学的後光を研究することで容易にされる.
- 短いGRBは,歴史的に光学検出を回避しており,その特徴づけを妨げています.
研究 の 目的:
- 短いGRBからの一時的な光学放射の最初の検出を報告する.
- 短いGRBの位置を特定し,その余光特性について説明する.
- 短いGRBの起源を調査し,その余光と長いGRBの余光を比較する.
主な方法:
- 短いGRBの正確なX線位置データを使用しました.
- GRB 050709に関連した一時的な光学放射 (R帯幅 ~23) が,サブアーク秒の精度で検出され,局所化されました.
- GRB 050709が爆発してから約34時間後の光学およびX線後の輝き特性を分析した.
主要な成果:
- 短いGRB 050709.9の光学的な後光が検出され,局所化されました.
- 光学的な後光は青い矮星銀河の郊外で見つかりました.
- 観測された光学およびX線後照明の特徴は,超相対性射出からのシンクロトロン放射に起因する長いGRBの特徴に類似しています.
結論:
- GRB 050709と関連した超新星が検出されていないことは,近隣の長いGRBの後の光と異なり,短いGRBの明確な起源を示唆しています.
- この発見は,短時間のガンマ線爆発の性質と祖先に関する重要な洞察を提供します.
- この発見は,短いGRBを光学的な後光を通して研究するための新しい道を開きます.
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