銀河団の巨大な核は赤道偏移4. 3で

T B Miller^1,2, S C Chapman^3,4,5, M Aravena⁶

¹Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada. tim.miller@yale.edu.

Nature

|April 27, 2018

まとめ

SPT2349-56はガスに富んだ14の銀河の密集した核で恒星が急速に形成されていますこの巨大な原群は宇宙がわずか14億年だった時に観測され銀河団形成の以前のモデルに異議を唱えました

科学分野:

宇宙学
銀河の進化
天体物理学

背景:

巨大な銀河団は宇宙の初期に形成されました
高赤偏移の銀河団の祖先 (プロトクラスター) は,シミュレーションで暗黒物質の過密度によって識別される.
観測されたプロトクラスターには,シミュレーションによって予測された急速なコア形成が欠けていることが多い.

研究の目的:

SPT2349-56の性質を調査する潜在的高赤偏移プロトクラスター
銀河団の形成の初期段階を理解するために
観測された構造と宇宙学的シミュレーションを比較する.

主な方法:

一酸化炭素とイオン化された炭素の観測
銀河の距離を測るための赤偏移測定
銀河の数密度,恒星形成率,速度分散の分析

主要な成果:

SPT2349-56は赤道偏移4.31で少なくとも14のガス豊富な銀河で構成されています.
銀河の恒星形成率は銀河の恒星形成の50~1000倍です
これらの銀河は130 kiloparsecの領域に密集しており形成が進んでいることを示しています

結論:

SPT2349-56は,初期の宇宙で急速に形成された銀河団の高度な核を表しています.
観測された密度と星形成は,以前のプロトクラスター観測とシミュレーションに異議を唱える.
この星系は今日知られている最も大きな銀河団の"つに進化するかもしれません

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