[C ii]を放出するガスの回転は,6.8の赤偏移で2つの銀河で
Renske Smit1,2, Rychard J Bouwens3, Stefano Carniani1,2
1Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, UK.
Nature
|January 12, 2018
まとめ
研究者らは,2つの初期の銀河からの炭素2 ([C ii]) 放射線を検出し,再イオン化の時代に関する新しい洞察を提供しました. これらの発見は,驚くほど明るい [C ii]信号を明らかにし,初期の銀河のダイナミクスは,宇宙の歴史においてずっと後に見られたものと同じであることを示唆しています.
科学分野:
- 宇宙学と天体物理学
- 宇宙 の 初期 の 研究
- 銀河の進化
背景:
- 銀河がニュートラルな水素をイオン化する時期です 銀河がニュートラルな水素をイオン化する時期です 銀河がニュートラルな水素をイオン化する時期です
- この時代を研究するには 遠く離れた赤道偏移の 銀河のスペクトルシグネチャーを 検出する必要があります
- これらの初期の銀河からのライマン-アルファと炭素-II ([C ii]) 放射の以前の探求は,散乱と昏睡による課題に直面しています.
研究 の 目的:
- 初期の宇宙の銀河のスペクトルシグネチャを特定し,特徴づけ,特に再イオン化の時代に.
- 高赤偏銀河における炭素II ([C ii]) 放射線の光度と性質を調査する.
- これらの初期の銀河のダイナミクスを 後に観測された宇宙の歴史と比較します
主な方法:
- 近赤外線光学を用いた高赤外線銀河候補の選択.
- 炭素II ([C ii]) λ=157.74 μmの放射線を特定する.
- 特定された銀河の赤偏移のスペクトロスコピク確認 (z=6.8540とz=6.8076).
主要な成果:
- [C ii] λ=157.74μmの放射が赤偏移 z=6.8540とz=6.8076の2つの銀河から検出されました.
- 観測された[C ii]の輝度は,6.5以上の赤偏移を持つ銀河で以前に発見されたものより著しく高い.
- [C ii]線の分析は,銀河の"宇宙の正午"に匹敵する回転動態を示唆する速度グラデーションを明らかにします.
結論:
- この研究は,宇宙の最初の10億年以内に2つの銀河からの [C ii] 放射を成功裏に特定しました.
- これらの発見は,初期の銀河における[C ii]の弱さに関する以前の仮定に異議を唱え,再イオン化を理解するための重要なデータを提供します.
- [C ii]線から推論された動的性質は,初期の銀河は,後の宇宙時代と同じような複雑な構造と回転を有することを示唆しています.
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