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サブミリメートルの波長で明るく輝く銀河の赤道偏移の平均値は2.4です
S C Chapman1, A W Blain, R J Ivison
1California Institute of Technology, Pasadena, California 91125, USA.
Nature
|April 18, 2003
まとめ
塵に隠された初期の宇宙の銀河は,サブミリメートル (submm) の観測を通して明らかになる. スペクトル学的な赤偏移は,これらの輝く塵の星系がクエザールと共存し,宇宙の進化に影響を与えたことを示しています.
科学分野:
- コスミック・マイクロ波・バックグラウンド・放射線
- 銀河の進化 銀河の進化 銀河の進化
- 高赤偏移天文学の天文学
背景:
- 初期の宇宙のエネルギー出力は,明るく,塵で覆われた銀河によって支配されていました.
- サブミリメートル (submm) の銀河は有意であるが,計測器の限界のために研究することは困難である.
- サブミリメートルの銀河の赤偏移 (z) を決定することは,それらの性質と宇宙の進化を理解するために重要である.
研究 の 目的:
- 特定された10個のサブミリメートルの銀河のスペクトロスクの赤道移転を決定する.
- 巨大なブラックホールの成長と輝く塵の星系との関係を調査するために.
- 高赤偏移のサブミリメートルの銀河の空間密度と宇宙的意義を評価する.
主な方法:
- 高解像度無線観測を用いたサブミリメートルの銀河の特定.
- 特定された銀河のサンプルのスペクトル図による赤偏移の決定.
- 銀河の空間密度の分析と,現代の輝く銀河との比較.
主要な成果:
- 10mm未満の銀河で得られたスペクトル赤移り.
- サンプルの赤偏移の中央値は2.4 (四分位数範囲は1.9-2.8) である.
- z>2のsubmm銀河は,現在の類似の銀河より約1,000倍も空間密度が高い.
結論:
- サブMM銀河はピーククエーサー活動と共存し,ブラックホールの成長と輝く塵の銀河の進化との関連を示唆しています.
- サブMM銀河は,初期の宇宙における恒星形成の重要な構成要素を表しています.
- 高解像度の無線観測は,以前は遮蔽されていたこれらの銀河を研究するのに有効です.
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