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宇宙の網と繋がっている 巨大な原銀河円盤
D Christopher Martin1, Mateusz Matuszewski1, Patrick Morrissey1
1Cahill Center for Astrophysics, California Institute of Technology, 1216 East California Boulevard, Mail code 278-17, Pasadena, California 91125, USA.
Nature
|August 7, 2015
まとめ
科学者たちは QSO UM287の近くで 巨大な回転するガスの円盤を発見し 寒い蓄積の流れで 燃え上がる巨大な原銀河構造だと示唆しています この発見は 銀河の形成と宇宙のネットワークについて 新たな洞察を与えてくれます
科学分野:
- 宇宙学
- 天体物理学
- 銀河の形成
背景:
- 銀河形成のメカニズムと銀河間媒介による燃料は完全に理解されていません.
- 水力学的なシミュレーションは 寒い蓄積の流れを 鍵となるプロセスとして提案し 宇宙の糸網に沿って 暗黒物質のハローに ガスを送り込んでいます
- これらの流れは 銀河の周りを回る構造を作り 最終的に銀河を形成すると仮定されています
研究 の 目的:
- QSO UM287の近くで発見された 光ファイラメントの物理的特性と動力学を調査する
- 銀河の形成過程との関連を 調べるため
- 熱線線が冷たく蓄積する という仮説を検証する
主な方法:
- QSOUM287の近くの 放射構造の2次元スペクトロスクープ調査を行いました
- フィラメント内のガスの速度プロファイルを分析した.
- ダークマターハロの質量を制限した.
主要な成果:
- 最も明るい放射領域を 拡張された回転する水素円盤として特定した.
- 円盤の速度プロファイルは,太陽質量10~13のダークマターのハロー内のガスと一致しています.
- プロト銀河円盤は 静止するフィラメントに繋がっているようで ハロのビリアル半径を超えています
結論:
- 観測された構造は 巨大な原銀河円盤に燃料を供給する 寒い蓄積の流れを強く示唆しています
- これは,寒い蓄積による銀河形成の理論的モデルを支持する観測証拠を提供します.
- この発見は 初期の銀河にガスを供給する 宇宙の糸状の役割について 新たな洞察を与えてくれます
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