最大のライマン-α星雲の中央電源は,極化放射線によって明らかにされています
Matthew Hayes1, Claudia Scarlata, Brian Siana
1Université de Toulouse, UPS-OMP, IRAP, Toulouse, France. matthew.hayes@ast.obs-mip.fr
Nature
|August 19, 2011
まとめ
ブロブLAB1で極化ライマン-α (Lyα) 放射が検出され,環状の構造を明らかにした. これは,Lyα光子が宿主銀河で発生し,中性水素によって散らばったことを示しています.
科学分野:
- コスモロジー・コスモロジーとは
- 天体物理学 天体物理学
- 銀河の進化 銀河の進化 銀河の進化
背景:
- 高赤偏移のライマンα (Lyα) 塊は,密集した宇宙領域に関連した珍しい,明るい構造です.
- 発光源と形状はラジオ銀河に似ていますが,まだはっきりしていません.
- 以前のLyα放出の極化研究では,ゼロ検出が得られました.
研究 の 目的:
- 高赤偏移の斑点におけるLyα放射の起源を調査する.
- 異なる刺激機構 (星爆発,ブラックホールの増殖,超新星,ハローガスの落下) を区別する.
- ブロブLAB1.1における偏光化されたLyα放射を検出および分析する.
主な方法:
- 先進的な望遠鏡技術を用いた LAB1 の観測.
- Lyα 放出ポラライゼーションの測定.
- 半径の関数としての極化分子の分析.
主要な成果:
- LAB1.1の中央地域では測定可能な二極化が見られなかった.
- 45 kiloparsecs.の半径で ~20%の極化分子が検出されました.
- ほぼ完全な極化リング構造が観察されました.
結論:
- 検出された極化型Lyα放射は,in situ光子生成と矛盾しています.
- Lyα光子は,星雲内の宿主銀河で生成された.
- 中性水素による散乱は,観測された二極化のメカニズムです.
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