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Updated: May 2, 2026
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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ビッグバンから約5億年後の拡大された若い銀河です
Wei Zheng1, Marc Postman, Adi Zitrin
1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA. zheng@pha.jhu.edu
Nature
|September 22, 2012
まとめ
宇宙再イオン化の理解に不可欠な初期の銀河は,重力レンズを用いて検出されました. これらの淡く若い銀河は豊富に見られ,潜在的に銀河間媒介を動かす.
科学分野:
- コスモロジー・コスモロジーとは
- 銀河の進化 銀河の進化 銀河の進化
- 初期の宇宙 天体物理学
背景:
- 銀河間媒体の再イオン化は赤道移転 z ≈ 6-11 頃に行われた.
- ビッグバン (z 10) の5億年未満で星を形成している若い銀河は,現在の望遠鏡の感度限界のためにほとんど未探査です.
- これらの初期の銀河を理解することは,再電離放射線の源を特定するための鍵です.
研究 の 目的:
- 淡く,赤道偏移が大きい銀河を検知し,特徴づけること.
- 初期の宇宙の銀河の性質を調査する.
- 銀河間媒体の再イオン化に起因する潜在的な源を特定する.
主な方法:
- 銀河団MACS J1149+2223による重力レンズを利用して,遠くの銀河を拡大した.
- 銀河団のマルチバンド観測を行った.
- 拡大した銀河データを分析して赤道移転と形成時間を決定した.
主要な成果:
- 赤い偏移 z = 9.6 ± 0.2 (宇宙年齢 490 ± 1500 万年) で重力的に拡大された銀河を検出しました.
- ビッグバンから2億年以内に銀河が形成されたと推定される (形成赤道偏移 14).
- この初期の宇宙時代の薄暗い銀河の豊富な観測.
結論:
- 淡い銀河は初期の宇宙に豊富に見られ,初期の再イオン化を支配する可能性があることを示唆しています.
- 重力レンズは,それ以外の方法で検出できないこれらの初期の銀河を研究するための強力なツールです.
- これらの発見は,宇宙再イオン化の源とメカニズムについての重要な洞察を提供します.
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