巨大でコンパクトな銀河の環銀河媒体を供給する100キロパルセックの風
David S N Rupke1, Alison Coil2, James E Geach3
1Department of Physics, Rhodes College, Memphis, TN, USA. drupke@gmail.com.
Nature
|November 1, 2019
まとめ
銀河の風は金属に富んだガスを 銀河の遥か彼方へ放出し 銀河周と銀河間の大規模な媒体を形成します 観測により 恒星爆発銀河から 巨大な流出が起こり 濃縮されたガスが 遥か遠くまで 流出しています
科学分野:
- 天文学
- 天体物理学
- 宇宙学
背景:
- ほとんどのバリオンは 銀河の周囲と銀河間にある
- 銀河の風がこの豊かな媒体を供給すると考えられています
- 観測されたスターバーストの風は,通常,円周より小さい10キロパルセックにしか達しません.
研究 の 目的:
- コンパクトなスターバースト銀河からの流出の範囲と性質を調査する.
- 銀河周回と銀河間を動かすメカニズムを理解する
主な方法:
- 銀河SDSS J211824.06+001729.4の光学積分フィールド観測
- 酸素 [O II]排出ラインを分析して,イオン化されたガスの流出をマッピングする.
- 中性ガス相とその速度を観測する.
主要な成果:
- 80×100平方キロパーセックの 離電流が検出されました
- 金属が濃縮されたガスは,砂時計の形状の星雲を通して堆積されていることが観察されました.
- 中性ガスの相は ~1,500 km/sの速度で20 kiloparsecに達した.
結論:
- コンパクトなスターバーストの 巨大な多相流出は 銀河周の環境を大きく豊かにします
- これらの流出は 理論的なモデルと一致しています 星形成の爆発によって引き起こされるのです
- 観測された流出構造は 避難した双極性バブルの考えを支持する.
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