遠いクワザールにおける巨大な星爆発の本質的なサインです
P Solomon1, P Vanden Bout, C Carilli
1Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, New York 11794, USA. psolomon@sbastk.ess.sunysb.edu
Nature
|December 12, 2003
まとめ
高赤道移転のクエザーは,水素シアン化物 (HCN) の観測によって明らかにされた,有意な密度の高い分子ガスを保持しています. この密集したガスは,巨大なスターバーストの燃料となり,クエーサーの形成に貢献しています.
科学分野:
- 天文学と天体物理学について
- 宇宙ガスダイナミクス 宇宙ガスダイナミクス
- 銀河の進化 銀河の進化 銀河の進化
背景:
- 高赤偏移の銀河 (z > 2) は,一酸化炭素 (CO) の放出によって豊富な分子ガスを示しています.
- 超大質量ブラックホールによって駆動されるアクティブ銀河核 (AGN) は,これらの銀河に共通しています.
- これらの銀河の高い赤外線光の源 (AGN,星形成,またはその両方) は,重要な問題です.
研究 の 目的:
- 高赤道移転銀河における密度の高い分子ガスの存在と性質を調査する.
- 恒星形成と赤外線光度における密度の高いガスの貢献度を測定する.
- 水素シアン化物 (HCN) を密度の高いガスのトレーサーとして利用する.
主な方法:
- レッドシフト z = 2.5579.9 のクエーサー"クローバーリーフ"からのHCN放射の観測
- ガス特性を推測するためにHCNラインの明るさの分析.
- CO観測と星形成モデルの比較.
主要な成果:
- クワザール"クローバーリーフ"からのHCN放射の検出.
- HCN線の明るさは,非常に密度の高いガスの10億太陽質量を示しています.
- この密集したガスは,巨大な星爆発の重要な特徴です.
結論:
- クォーサー"クローバーリーフ"は,密度の高い分子ガスが燃料となる大きなスターバーストをホストしています.
- スターバーストと活発な銀河核の両方がクワザーの高い赤外線光度に貢献しています.
- HCNは,高赤道移転銀河の恒星形成に不可欠な密度の高いガスの効果的なトレーサーです.
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