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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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静止している巨大な銀河の赤道偏移 4.658

Adam C Carnall1, Ross J McLure2, James S Dunlop2

  • 1Institute for Astronomy, School of Physics & Astronomy, University of Edinburgh, Royal Observatory, Edinburgh, UK. adam.carnall@ed.ac.uk.

Nature
|May 22, 2023
PubMed
まとめ

天文学者は巨大な静止銀河 GS-9209 を発見しました ビッグバンからわずか125億年後です この銀河は消える前に 急速に星を形成し 銀河形成モデルに挑戦しました

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科学分野:

  • 宇宙の歴史
  • 銀河の形成と進化
  • 初期の宇宙の天体物理学

背景:

  • 初期の銀河の急速な組成は 現在の銀河形成物理学に 挑戦しています
  • ジェームズ・ウェブ宇宙望遠鏡 (JWST) は 初期の多くの銀河を確認し この謎を悪化させました
  • 巨大な静止銀河は 急速に形成され その後 恒星形成が止まると 宇宙史の初期に 驚くほど早く観測されました

研究 の 目的:

  • 宇宙の初期に 静止していた巨大な銀河の存在を 観測する
  • このような極端な初期の銀河の性質と形成の歴史を調査する.
  • 銀河の形成モデルへの影響を理解するために

主な方法:

  • JWST近赤外線スペクトログラフ (NIRSpec) を利用してスペクトル観測を行った.
  • 赤偏移を確認して 銀河の性質を推測した
  • 恒星質量と恒星形成の歴史を決定した.

主要な成果:

  • 巨大な静止銀河であるGS-9209のスペクトロスコープによる確認,赤偏移 z = 4.658 (ビッグバンから125億年).
  • 推論された恒星質量は3.8 ± 0.2 × 10^10 Mである.
  • GS-9209は宇宙が約800万年前に消える前に,約200万年にわたって急速に星を形成した.

結論:

  • GS-9209は宇宙の初期に 形成された巨大な静止銀河です
  • この発見は 銀河の急速な構成と消し去りに 重要な観測的証拠を提供します
  • この銀河は初期の高赤偏移物体と 巨大な局所銀河の間の 潜在的なリンクです