10億年以上に渡るガスの流れから,ミリメートル以下で輝く銀河の形成
Desika Narayanan1, Matthew Turk2, Robert Feldmann3
1Haverford College, 370 West Lancaster Avenue, Haverford, Pennsylvania 19041, USA.
Nature
|September 25, 2015
まとめ
新しい宇宙学的シミュレーションにより,ミリメートル以下で明るく輝く銀河のモデル化が成功し, 巨大なダークマターのハロの中で恒星形成の長期間を明らかにしました. これらの明るく輝く初期宇宙の銀河は 融合ではなく ガス崩壊によって形成され 宇宙の進化を理解する鍵となります
科学分野:
- 宇宙学と天体物理学
- 銀河の形成 と 進化
背景:
- 赤い偏移が大きいサブミリメートルの銀河は,遠くの赤外線で観測される非常に明るい,強烈に星を形成するシステムです.
- 物理的な起源と観測された性質の同時一致 (恒星質量,恒星形成率,ガス分数,環境) はシミュレーションでは捉え難いままです.
- これらの銀河は巨大なダークマターのハロの中にあり 光学波長では観測が困難です
研究 の 目的:
- 観測された亜ミリメートルの銀河の特性を再現できる宇宙学的な水力学的な銀河形成シミュレーションを開発する.
- 形成のメカニズムと 進化の経路を調査する
主な方法:
- 銀河の形成をシミュレートした
- 巨大なダークマターのハロの中で 銀河群をモデル化している
- 恒星形成率,ガス分数,恒星質量,環境の影響を分析した.
主要な成果:
- シミュレーションにより 観測された物理的条件に適合する サブミリメートルの銀河が形成されました
- 恒星形成のピークは年間500~1,000太陽質量で 銀河群では赤偏移が2~3で観測された.
- 激しい恒星形成は 大規模な合併ではなく 早期の恒星フィードバックによって促進される ガス貯蔵庫の崩壊によって促進されます
結論:
- 高赤偏移の銀河のサブミリメートルの輝きは 長く10億年近く続きます
- これらの銀河は,初期の宇宙の原始群の質量増量に大きく貢献しています.
- サブミリメートルの明るさの多くの銀河は 解明されていない複数の構成要素で構成されています
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