重力弧トモグラフィによる赤偏移1の塊状でアニソトロピックな銀河のハロ
Sebastian Lopez1, Nicolas Tejos2, Cédric Ledoux3
1Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile.
Nature
|February 8, 2018
まとめ
遠くの銀河の周りの環境をマッピングすることは 難しいことです この研究では,濃縮されたガスをマッピングするために重力弧を使用し,凝固したアニゾトロプ的分布を明らかにし,流出ではなくリサイクルされた材料を示唆しました.
科学分野:
- 天文学と天体物理学
- 宇宙ガスダイナミクス
- 銀河の進化
背景:
- 恒星形成の銀河は100キロパーセックを超えて広がる 金属に富んだガスの広大なハロを持っています
- クワザール吸収線を用いた以前の研究は,この環銀河媒介 (CGM) の限られた一次元的な見方を提供した.
- CGMの構造を理解することは 銀河の進化におけるバリオン再利用の解読に不可欠です
研究 の 目的:
- 銀河のハロで濃縮されたガスの空間的および運動的分布をマッピングするための新しい技術を開発し,適用する.
- 赤道偏移0.98で 環銀河媒体の構造と性質を調査する
主な方法:
- 巨大な重力弧の背景源のインテグラルフィールド (トモグラフィ) スペクトロスコーピーを利用した.
- マグネシウムII (Mg II) 吸収の分布をマッピングした.
- 環銀河ガスの空間的範囲,凝縮度,運動的性質を分析した.
主要な成果:
- 銀河から距離が延びるにつれて吸収力が低下する 円形銀河媒体を明らかにした.
- 濃縮ガスが同位体分布していないことが示された.
- 観測された最小の運動変動は,大きな予測領域 (約. 600 kpc2) で,速度は狭い範囲に限られている.
結論:
- 観測されたガス分布と動力学は 銀河のハロの中に 巻き込まれたリサイクル物質の存在を示唆しています
- この発見は 富んだガスの分布に galaktic outflows にだけ依存するモデルに 挑戦しています
- グラビテーション・アーチ・トモグラフィーは 銀河周りの環境を研究する強力な新しい方法を提供します
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