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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 16, 2013
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若き宇宙の恒星形成銀河の通常の巨大銀河の高分子ガスの分子は,
L J Tacconi1, R Genzel, R Neri
1Max-Planck-Institut für extraterrestrische Physik (MPE), Giessenbachstr. 1, 85748 Garching, Germany. linda@mpe.mpg.de
Nature
|February 12, 2010
まとめ
遠くの銀河は分子ガスが豊富で,急速な星形成を促していた. このガスの含有量は,現在の銀河よりも大幅に高かったため,初期の宇宙ではガスの補給が継続的であったことを示唆しています.
科学分野:
- 天文学 天文学
- コスモロジー・コスモロジーとは
- 天体物理学 天体物理学
背景:
- 恒星は,局所的に稀な冷たい分子星間ガスから形成され,天の川銀河の恒星形成を制限しています.
- 遠くの宇宙の巨大な銀河は,より速く星を形成し,より高い分子ガス含有量を暗示しています.
- これまでの分子ガスの観測は,合併やクエザールなどの希少で明るく輝く物体に限られていた.
研究 の 目的:
- 典型的な巨大な恒星形成銀河の赤道偏移 z ≈ 1.2 と z ≈ 2.3.3 の分子ガス含有量を調査する.
- 初期の巨大な銀河のガス豊かさと恒星形成の効率を理解するために.
- 遠い銀河のガスの分子を,地元の宇宙の分子のものと比較する.
主な方法:
- 典型的な巨大な恒星形成銀河のサンプルにおける分子ガスの調査を行った.
- 分析した銀河の平均赤偏差
は,約1.2と2.3.3で,銀河の平均赤偏差 は約1.2と2.3. - 銀河全体のバリオン質量に対する冷たいガスの割合を測定した.
主要な成果:
- 遠くの恒星形成銀河は,ガスが非常に豊富で,局所的な巨大な渦巻き銀河の3〜10倍以上の分子ガスの分子が存在していた.
- z = 2.3 のとき,平均冷気分子は ~44% であった; z = 1.2 のとき,それは ~34% であった.
- 恒星形成の効率は宇宙の時代に強く依存しなかった.
結論:
- 若くて巨大な銀河は,これまで考えられていたよりも分子ガスがかなり豊富でした.
- 観測されたガスの分子は,初期の銀河には,新鮮なガスの半連続補給のためのメカニズムが必要であることを示唆しています.
- この発見は,初期の宇宙における恒星形成の急速な速度を説明するのに役立ちます.
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