双極流出は,赤偏移 z ≈ 1 で大規模な銀河に対して 10 kpc になります

Yucheng Guo¹, Roland Bacon², Nicolas F Bouché²

¹Univ Lyon, Univ Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, Saint-Genis-Laval, France. yucheng.guo@univ-lyon1.fr.

Nature

|December 6, 2023

まとめ

銀河の進化に不可欠な銀河の流出は MUSE を使用して観測されました. エッジオン銀河はMg IIの放出が増加し,双極流出形が円周銀河系に10%以上広がった.

科学分野:

天文学と天体物理学
銀河進化研究
宇宙ガスダイナミクス

背景:

銀河の流出は銀河の質量と恒星形成を制御します
理論的なモデルは,銀河周回媒介 (CGM) に広がる双極流出を予測しています.
高赤偏流出を観測することは,低密度と表面の明るさのために困難です.

研究の目的:

より高い赤偏移 (z ≈ 1) での銀河流出の存在と幾何学を調査する.
双極流出の理論的な予測をテストする
巨大な銀河のCGMスケールの流出率を決定する.

主な方法:

MUSE (マルチユニット・スペクトロスコーピック・エクスプローラー) の超深層画像を使用した.
z ≈ 1 で銀河のサンプルを取り巻くMg IIの平均放射を分析した.
観測された放射は銀河の傾きと恒星の質量と相関している.

主要な成果:

検出されたMg IIの放出は,10 kpc以上のスケールでガスの流出を示唆しています.
エッジオン銀河のマイナー軸に沿って放出が増加しています.
双極幾何学を示唆する弱い同極放射を発見した

結論:

この発見は,銀河盤に垂直に二極の円形の流出があるという仮説を裏付けている.
CGMスケールのアウトフローは,恒星質量 10^9.5 M の銀河で一般的です.
この研究は,遠くの銀河における流出幾何学の観測証拠を提供します.

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