ビッグバンから30億年後の核形成段階にある巨大な銀河
Erica Nelson1, Pieter van Dokkum1, Marijn Franx2
1Astronomy Department, Yale University, New Haven, Connecticut 06511, USA.
Nature
|August 28, 2014
まとめ
天文学者たちは,11億年前に形成された銀河の核を発見し,高ガス速度の分散と密度の高い構造を示しています. この発見は,初期の銀河の進化と巨大な銀河の形成についての洞察を提供します.
科学分野:
- 宇宙の進化は宇宙の進化である.
- 銀河の形成と進化について
- 天体物理学 天体物理学
背景:
- 巨大な銀河は,宇宙の歴史の初期に密度の高い恒星核を形成すると考えられています.
- 以前の研究では,高ガス速度の分散や小型の銀河が特定されましたが,形成中の核の両方の特徴はありませんでした.
- 以前は,形成中の核の恒星構造とガスダイナミクスを兼ね備えた天体が見つかりませんでした.
研究 の 目的:
- 形成過程中の候補銀河核の発見を報告する.
- この初期の銀河の恒星構造とガスダイナミクスを特徴づけるために.
- 初期の宇宙における巨大な銀河の形成メカニズムを理解する.
主な方法:
- 赤道偏移 z = 2.3 (11億年前) の銀河の観測.
- 星の質量,半光の半径,恒星形成率の測定.
- 銀河内のガス速度の分散の分析.
主要な成果:
- 候補コアの GOODS-N-774 の識別,赤道偏移 z = 2.3.3 で
- GOODS-N-774の恒星質量は太陽質量1000億倍で,半光半径は1.0キロパーセクです.
- この銀河は,恒星形成のための高ガス速度分散 (317 ± 30 km/s) を表しており,コンパクトな静止銀河や近くの巨大な円銀河のような子孫に似ています.
結論:
- 発見された銀河系,GOODS-N-774は,希少で,巨大な銀河の核を形成しています.
- その性質は,初期の銀河核形成の理論的モデルと一致しています.
- このような多くの恒星形成の核は,現在の調査によって隠され,見逃され,新しい検出方法が必要であることを示唆しています.
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