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初期の宇宙における塵の星爆発銀河は,重力レンズレンズによって明らかになった
J D Vieira1, D P Marrone, S C Chapman
1California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA. vieira@caltech.edu
Nature
|March 15, 2013
まとめ
粉塵の星爆発銀河は,以前考えられていたよりも,初期の宇宙ではより一般的でした. この研究では,ミリメートルの波長調査と重力レンズ測定を用いて,赤偏移が大きい (z > 4) このような多数の銀河を発見しました.
科学分野:
- 宇宙の進化とは,宇宙の進化である.
- 銀河系外天文学とは
- 銀河の形成と進化について
背景:
- 銀河の進化の研究は,輝く塵の星空の銀河が,初期の宇宙で1,000倍も多く存在していたことを明らかにしています.
- これらの銀河の赤偏移分布,特にz > 4の分布を測定することは困難でした.
研究 の 目的:
- 高い赤偏移 (z > 4) で,塵の星爆発銀河の豊富さを決定する.
- 炭素一酸化物線放射を利用して,ミリメートル単位で選択された源に対して堅固な赤偏移を得るため.
主な方法:
- 炭素一酸化物線排出をターゲットとしたミリメートルの波長赤偏移の調査を行った.
- フォアグラウンドの銀河による重力レンズを特定するために高解像度画像を使用しました.
- 26のターゲットソースのうち23のスペクトルラインを検出しました.
主要な成果:
- 23の源で強力な赤偏移が得られ,12の源で複数の線が検出されました.
- レッドシフト z > 4 の少なくとも 10 つのソースが見つかりました.
- 背景のオブジェクトは,極限恒星形成によって駆動される超明るさの赤外線銀河として識別され,レンズの幾何学モデルによって確認されました.
結論:
- 高い赤道移転で星爆発銀河の粉塵の割合は,以前に推定されたよりも大きい.
- 重力レンズは,これらの遠い,明るい銀河を観測する上で重要な要因です.
- これらの発見は,初期の銀河の進化と恒星形成のモデルを洗練しています.
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