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ガンマ線爆発:初期の宇宙における巨大な爆発
G Cusumano1, V Mangano, G Chincarini
1INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, 90146 Palermo, Italy. cusumano@ifc.inaf.it
Nature
|March 10, 2006
まとめ
観測された最も遠い長いガンマ線爆発 (GRB) は,128億年前に発生しました. この宇宙の爆発は,初期の恒星形成と若い宇宙におけるブラックホールの発展についての洞察を提供します.
科学分野:
- 天文学と天体物理学について
- コスモロジー・コスモロジーとは
- 高エネルギー天体物理学
背景:
- 長いガンマ線爆発 (GRB) は,巨大な星の崩壊に関連したエネルギー的な現象です.
- 初期の宇宙 (ビッグバン後約8億9千万年) は,恒星形成と進化が顕著な時期でした.
研究 の 目的:
- これまで観測された最も遠い長ガンマ線爆発 (GRB 050904) の観測結果を報告し,分析する.
- 初期の宇宙の条件,特に星形成とブラックホールの起源,再イオン化時代の近くを調査する.
主な方法:
- ガンマとX線観測を用いて,GRB 050904.4を検出・分析した.
- GRBの距離と年齢を定めるために赤偏移 (z = 6.29) を決定しました.
主要な成果:
- GRB 050904は6.29の赤偏移で検出され,その起源は128億年前に遡ります.
- このイベントは,宇宙が約8億9千万年前の時,宇宙再イオン化時代の近くで起こった.
- 初期の宇宙における巨大な恒星の進化とブラックホールの形成の存在を確認した.
結論:
- この遠いGRBの観測は,長いGRBの崩壊モデルを支持しています.
- ブラックホールの形成につながる恒星形成と進化は,初期の宇宙で急速に起こったことを示しています.
- 銀河の進化と再イオン化の時代の条件を理解するための重要なデータを提供します.
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