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遠方 の 銀河 から 脱出 し て いる イオン化 する 紫外線 光子 を 検出 する 引力 レンズ
T Emil Rivera-Thorsen1, Håkon Dahle2, John Chisholm3,4
1Institute of Theoretical Astrophysics, University of Oslo, 0315 Oslo, Norway. trive@astro.su.se.
Science (New York, N.Y.)
|November 9, 2019
まとめ
初期の銀河からの 鮮明な紫外線は 狭いチャネルを通って 宇宙をイオン化する ハッブル望遠鏡の観測は,太陽爆発弧銀河からのこれらのイオン化フォトンが再イオン化の時代にどのように貢献したか示しています.
科学分野:
- 宇宙学
- 天体物理学
- 銀河の進化
背景:
- 初期の宇宙には 中性ガスが含まれており それは最初の星や銀河からの 紫外線でイオン化されました
- 再イオン化の時代を説明するために 銀河から脱出するイオン化フォトンの仕組みを理解することは 極めて重要です
研究 の 目的:
- 再イオン化後の銀河から 放射性紫外線光子の 逃亡を調査する
- フォトンの脱出を促進するメカニズムとその再イオン化への貢献を理解する.
主な方法:
- ハッブル宇宙望遠鏡による重力レンズ銀河PSZ1-ARC G311.6602-18.4624の観測を用いた.
- 光学的に厚いガスの狭いチャネルを通るイオン化フォトンの脱出を研究するために,複数の画像光を分析した.
- フォトンの逃亡の視界を高めるために重力レンズ拡大を使用した.
主要な成果:
- コンパクトな恒星形成領域から電離光子の 鮮明で多重な放出を観測した.
- 光学的に厚いガスを介して光子の脱出を促進する狭いチャネルを特定しました.
- 宇宙の再イオン化への 銀河の貢献が確認されました
結論:
- 太陽爆発の弧は,宇宙再イオン化に寄与するイオン化フォトンの脱出の直接的な証拠を提供します.
- この研究は重力レンズがどのようにこれらの重要なプロセスを観察するのに役立つかを示しています.
- 複数の視線で 銀河間中性水素の吸収を測る
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