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最初の星を,宇宙赤外線背景の変動で追跡した
A Kashlinsky1, R G Arendt, J Mather
1Observational Cosmology Laboratory, Goddard Space Flight Center, Greenbelt, Maryland 20771, USA. kashlinsky@stars.gsfc.nasa.gov
Nature
|November 4, 2005
まとめ
人口III星として知られる最初の星は,宇宙の初期に形成されました. この研究で検出されたそれらの赤外線光の変動は,初期の宇宙に関する手がかりを提供します.
科学分野:
- コスモロジー・コスモロジーとは
- 天体物理学 天体物理学
- 初期の宇宙の研究 初期の宇宙の研究
背景:
- 1Gyr以下で観測された銀河は金属の濃縮を示し,以前の金属のない星 (人口III) を暗示しています.
- 宇宙マイクロ波背景 (Cosmic Microwave Background, CMB) の極化により,ビッグバンから200万年後に恒星形成が始まったことが示唆される.
- 人口IIIの恒星は,現在の恒星集団よりもかなり大きいと理論化されています.
研究 の 目的:
- 人口IIIの星の間接的な証拠を検出するために.
- 宇宙赤外線背景 (CIB) の変動を初期恒星形成のトレーサーとして分析する.
- 原始密度場の条件を調査する.
主な方法:
- 深空と地上からの観測を行いました.
- 近赤外線スペクトルにおける分散流動の変動を測定した.
- 星や銀河からのフロアグラウンドの汚染を削除しました.
主要な成果:
- 拡散赤外線流の中でアニゾトロピーが検出されました.
- これらの変動は,機器のノイズとローカルな前景を上回ります.
- 検出された信号は,集団IIIの恒星からの放射に起因する.
結論:
- この発見は,集団IIIの星の存在と影響の証拠を提供する.
- 検出された変動は,これらの初期の巨大な恒星からの予想される放射と相関しています.
- この研究は,最初の星によって支配された時代の洞察を提供します.
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