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在一个罕见的大设计螺旋星系中,在红移z = 2.18的高速分散
David R Law1, Alice E Shapley, Charles C Steidel
1Dunlap Institute for Astronomy & Astrophysics, University of Toronto, 50 St George Street, Toronto M5S 3H4, Ontario, Canada. drlaw@di.utoronto.ca
Nature
|July 20, 2012
概括
我们观察到一个具有红移z=2.18的大型螺旋星系,发现它的盘是动态热的. 这表明螺旋结构可能是通过热,巨大的磁盘中微小的合并而形成的,这解释了它们在早期宇宙中的稀有性.
科学领域:
- 银河系的宇宙进化过程
- 银河系的形成和演变.
- 观测天体物理学是一种观测天体物理学.
背景情况:
- 大型螺旋星系在本地很常见,但在高红移 (z > 2) 时很少见.
- 早期螺旋星系的稀有性归因于动态"热"盘或仪器限制.
- 螺旋星系在较低的红移 (z < 2) 时变得越来越多,因为磁盘速度分散性下降.
研究的目的:
- 为了研究一个高红移的大设计螺旋星系的形成和特征.
- 了解早期螺旋星系磁盘的动态状态.
- 为了解释早期宇宙中观察到的螺旋星系的稀有性.
主要方法:
- 在星系Q2343-BX442中对电离气体的光谱观测,z = 2.18.8.
- 银河系盘的动力学分析以确定其动态状态.
- 观察到的属性与星系进化理论模型的比较.
主要成果:
- 观察到的螺旋星系Q2343-BX442在z=2.18.18处呈现出一个动态热盘.
- 银河系动力学与经历小规模合并的厚盘相一致.
- 小规模合并期间的潮相互作用可以诱导短暂的螺旋结构.
结论:
- 在Q2343-BX442中,螺旋结构很可能源于小规模合并期间的潮效应.
- 热,大盘中的潮诱导螺旋的短工作周期 (<100 Myr) 解释了它们在高红移时的稀有性.
- 这一发现挑战了以前关于早期螺旋星系稀缺性的解释.
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