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高赤偏移で低興奮分子ガスの巨大な貯蔵庫です
P Papadopoulos1, R Ivison, C Carilli
1Leiden Observatory, PO Box 9513, 2300 Leiden, The Netherlands.
Nature
|May 9, 2001
まとめ
天文学者は,高赤位移転クワザールで,一酸化炭素 (CO) 線を用いて,低興奮分子ガスを大量に発見した. この発見は,以前の観測が初期の銀河の分子ガス含有量を著しく過小評価していた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
- 宇宙のガスと塵の研究
- 銀河の進化 銀河の進化 銀河の進化
背景:
- 分子水素 (H2) は,ガス豊富な銀河の恒星形成と活発な銀河核 (AGN) を燃料にしています.
- 炭素一酸化物 (CO) 排出線は,分子ガスの性質を追跡する.
- 以前は,高赤道移転の銀河では,より高いCOトランジションのみが観測され,分子ガス質量を潜在的に過小評価していました.
研究 の 目的:
- 高赤道移転銀河における低刺激分子ガスの存在と性質を調査する.
- 以前の観測が,総分子ガス含有量を過小評価したかどうかを判断する.
- 銀河の初期進化における分子ガスの役割を調査する.
主な方法:
- 12CO (J = 1 --> 0 と J = 2 --> 1) の最も低い興奮線を利用して,赤偏移 z = 3.91 でクエーサー APM08279+5255 を観測しました.
- クワザール周りの分子ガスの分布をマッピングしました.
- 検出された分子ガスの興奮レベルと質量を分析した.
主要な成果:
- クワザールAPM08279+5255.5の周りに大量の低刺激分子ガスを発見した.
- クワザール核の近くで,熱くて密度の高いガスの存在が確認されました.
- 拡張された分子ガス貯蔵庫が明らかにされました. これまでに検出されたガスよりも10〜100倍の質量があります.
結論:
- 低興奮分子ガスの有意な量は,高赤道移転銀河 (z > 3) で一般的かもしれない.
- COトランジションの高さを用いた過去の観測は,初期の宇宙における総分子ガス質量を過小評価した可能性が高い.
- この発見は,銀河の形成と高赤移転時の進化を理解する上で大きな意味を持つ.
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