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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
初期の宇宙における塵のないクエザール
Linhua Jiang1, Xiaohui Fan, W N Brandt
1Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USA. ljiang@email.arizona.edu
Nature
|March 19, 2010
まとめ
初期の宇宙のクエーザーは熱い塵を欠いているので,若い,第一世代の物体であることを示唆しています. 彼らの熱塵の豊富さは,古いクエザールとは異なり,ブラックホールの成長と相関しています.
科学分野:
- 天文学 天文学
- コスモロジー・コスモロジーとは
- 天体物理学 天体物理学
背景:
- 赤道移動 z~6 の遠いクエーザーは,赤道移動が低いクエーザーの性質に似ている.
- この類似性は,進化した物体を示唆し,初期の宇宙年齢 (現在の年齢の7%) に矛盾する.
- 以前の観測では,熱い塵が欠けている1つのz~6クエーサーが観測され,高赤偏移の塵の特性に関する疑問が提起された.
研究 の 目的:
- z~6個のクエーサールにおける熱い塵の有無を調査する.
- 熱い塵のないクエーサールが初期の宇宙に特有のものであるかどうかを判断する.
- 熱い塵の豊富さとブラックホールの質量進化の関係を理解する.
主な方法:
- レッドシフトz~6.6で21個のクエサールのサンプルを分析した.
- 熱い塵からの検出可能な放射を検索しました.
- 中央ブラックホールの質量と,熱い塵の豊富さを比較した.
主要な成果:
- 21 z~6 のクエーサーのうち,検出可能な熱い塵のない2番目のクエーサーを発見しました.
- 低赤道移転でこれらの熱い塵のないクエーサーに類似するものは見つかりませんでした.
- z~6個のクエーザーの熱塵の豊富さは,低赤道移転のブラックホールの質量増加と相関することを示した.
結論:
- z~6個のクエーザーは,急速な増殖と塵の形成を伴う初期の進化の段階を表しています.
- 観測された2つの熱塵のないクエザーは,おそらく第一世代の物体である.
- これらの若いクエザーは,塵のない環境で発生し,まだ大きな熱い塵を形成していない.
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