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銀河団のハローの2つの恒星成分
Daniela Carollo1, Timothy C Beers, Young Sun Lee
1INAF-Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy. carollo@mso.anu.edu.au
Nature
|December 14, 2007
まとめ
ミルクウェイは銀河系です.
科学分野:
- 天文学と天体物理学について
- 宇宙構造の形成とは,宇宙構造の形成である.
- 銀河の進化について.
背景:
- 銀河団のハロは,初期の宇宙の物体に関する重要なデータを含んでいる.
- 以前の研究では,ハローの構造に二分性があると示唆されていた.
- この二分論の証拠は,小さなサンプルサイズに基づいていました.
研究 の 目的:
- 銀河団のハローが2つの異なる構成要素に分けられることを明確に示すために.
- この2つのハロコンポーネントの違いを特徴づけるために.
- 各コンポーネントの形成メカニズムを推論する.
主な方法:
- 空間密度プロフィールの分析.
- 恒星の軌道特性の調査.
- 恒星の金属性 (重元素の豊富さ) を測定する.
主要な成果:
- ハロは内側と外側に分けられます.
- 内側のハロは,漸進的な回転とより高い金属性を表しています.
- 外側のハロは逆行回転と低金属性 (内側のハロの1/3).
結論:
- 特徴的な特性は,内外ハロースの形成経路が根本的に異なることを示唆しています.
- 内部ハロは,消散的な合併によって形成された可能性が高い.
- 外側のハロは,おそらく,消散のない合併と,原銀河団の潮的な破壊によって形成された.
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