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巨大なコンパクト銀河NGC 1277の周りの赤球群の単一の集団
Michael A Beasley1,2, Ignacio Trujillo1,2, Ryan Leaman3
1Instituto de Astrofísica de Canarias, Calle Vía Láctea, La Laguna, Spain.
Nature
|March 14, 2018
まとめ
巨大な銀河は通常,2つの段階で球状の星団を形成し,赤と青の星団に導きます. 遺物銀河NGC 1277は赤色の星団のみを示しており,その後の質量増加が最小であることを示しています.
科学分野:
- 銀河天文学
- 銀河の形成 と 進化
- 恒星群
背景:
- 巨大な銀河は2段階のプロセスを経て形成されると考えられています 初期のガスの崩壊とスターバストで その後は蓄積です
- 球状クラスターシステムは,金属に富んだ (赤い) クラスターを作り出す初期の爆発と,金属に乏しい (青い) クラスターを追加した後の蓄積で,同様に形成されると考えられています.
- この二重形成のメカニズムは,巨大な銀河の球状群のシステムにおける多様式光学色の分布をもたらすことが期待されている.
研究 の 目的:
- NGC1277の大型残骸銀河候補の球体群を調査する.
- 巨大な銀河とその球状星団の形成モデルをテストする
- NGC 1277が形成後の増殖が最小限にある本物のレリックス銀河であるかどうかを判断する.
主な方法:
- NGC1277の大型レリックス銀河候補の光学観測を行った.
- 球体群の光学色の分布を分析した.
- 星質を推定するために 可能な合併の歴史のシミュレーションを使用した.
主要な成果:
- NGC 1277の球状星団系は,ユニモダルで完全に赤色の光学分布を示している.
- これは他の巨大な銀河と大きく対照的です クラスターシステムには通常 青いクラスターが含まれています
- シミュレーションによると,NGC 1277の累積した恒星質量は,全恒星質量の最大10%である.
結論:
- NGC 1277の球状星団の赤色のユニモダル色分布は,最初の崩壊後に最小の質量増加を示しています.
- NGC 1277は本物のレリックス銀河として確認され",赤のナグジェット"銀河分類を支持しています.
- 巨大な銀河の 青い球状星団は,より小さな衛星銀河の 増加した集団を表しています.
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