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粉塵に覆われた巨大な最大星爆発銀河で,赤道偏移は6.34です
Dominik A Riechers1, C M Bradford, D L Clements
1California Institute of Technology, 1200 East California Boulevard, MC 249-17, Pasadena, California 91125, USA. dr@astro.cornell.edu
Nature
|April 20, 2013
まとめ
天文学者は,赤道偏移6.34の巨大な星爆発銀河を発見し,宇宙のはるかに早い時期に激しい恒星形成が起こったことを示しました. この発見は,成熟した銀河環境がビッグバンから8億8千万年後に存在していたことを明らかにしています.
科学分野:
- 宇宙の進化とは,宇宙の進化である.
- 銀河の形成 銀河の形成
- 初期の宇宙 天体物理学 宇宙物理学
背景:
- 巨大な銀河は,おそらく初期の宇宙の時代に星を急速に形成した.
- ビッグバンの直後の巨大なスターバーストの祖先の存在は不明です.
- 以前の観測では,選択バイアスによる塵の星爆発の赤道偏移が低いことが示唆されていた.
研究 の 目的:
- 非常に高い赤偏移で大規模なスターバースト銀河を特定するために.
- 初期の宇宙における成熟した銀河環境の存在を調査する.
主な方法:
- 候補銀河を特定するために,サブミリメートルの色選択技術を使用しました.
- 分子と原子の微細構造の冷却線を用いて赤偏移を決定した.
- 星間介質の性質と星形成率を分析した.
主要な成果:
- レッドシフト z = 6.34.3 で大規模なスターバースト銀河を特定しました.
- 興奮した,化学的に進化した星間介質の1000億太陽質量を持つ銀河を明らかにしました.
- 恒星形成の速度を測定し,銀河の2,000倍以上の速度を測定しました.
結論:
- 巨大なスターバースト銀河は,ビッグバンから8億8千万年ほど前に存在していた.
- 激しい,巨大なスターバーストを形成できる環境は,初期の宇宙に存在していました.
- 高赤道移転で恒星形成の普遍的な衰退の概念に異議を唱える.
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