2の赤道移転で成熟した銀河団のスペクトル確認
J P Willis1, R E A Canning2, E S Noordeh2,3
1Department of Physics and Astronomy, University of Victoria, Victoria, Canada. jwillis@uvic.ca.
Nature
|January 3, 2020
まとめ
この研究は,成熟した銀河と,初期の宇宙構造の形成に関する洞察を提供している赤道移転2の進化した銀河団XLSSC 122を明らかにしています.
科学分野:
- 宇宙学
- 銀河の進化
- 天体物理学
背景:
- 銀河団は宇宙の増殖によって形成された 最大のウイルス化された構造です
- 初期の宇宙の銀河団は 宇宙の進化について 重要な洞察を与えてくれます
- XLSSC 122は当初,X線源として検出され,Sunyaev-Zel'dovich効果によって確認された.
研究 の 目的:
- 進化した銀河団XLSSC 122の性質を z=2で調べるため
- 銀河の恒星年齢と形成赤道移転を決定する
- 高赤偏移の銀河団のクラスター内環境を特徴付ける.
主な方法:
- メンバー銀河を特定し,赤偏移を決定するための光学スペクトル観測.
- 恒星の年齢と塵の含有量を推定する光測定法.
- X線とSunyaev-Zel'dovichデータによるクラスター内ガスの性質の分析.
主要な成果:
- XLSSC 122のメンバー銀河は37個で,平均赤道偏移は1.98である.
- 恒星の平均年齢は298億年で 恒星形成は赤道移転12で始まる.
- 熱い (ケルヴィン600万度) 金属の豊富なクラスター内媒体を確認した.
結論:
- XLSSC 122は初期の宇宙時代に比べると 驚くほど成熟した銀河団です
- この発見は,初期の宇宙に進化した恒星集団と 集束内のガスの存在を示しています.
- この研究は,若い宇宙における銀河団の形成と進化の詳細な見解を提供します.
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