直接检测银河系光环暗物质的直接检测
B R Oppenheimer1, N C Hambly, A P Digby
1Astronomy Department, University of California-Berkeley, Berkeley, CA 94720-3411, USA. bro@astron.berkeley.edu
Science (New York, N.Y.)
|March 27, 2001
概括
天文学家直接检测到银河系光环暗物质由老,凉爽的白矮星组成. 这一发现解释了以前对银河系中看不见的物质的间接观测.
科学领域:
- 天文学和天体物理学
- 银河系结构和进化过程
- 宇宙学的宇宙学是什么?
背景情况:
- 据认为,银河系的球状光环中含有大量的看不见的物质或暗物质.
- 间接观测表明,白矮星可能占到银河系暗物质的50%.
- 以前的调查缺乏检测这些微弱的灵敏度,古老的恒星残骸.
研究的目的:
- 为了进行调查,寻找具有高太空速度的微弱,凉爽的白矮星.
- 为了识别属于银河系球状光环群的白矮星.
- 为银河系暗物质的组成提供直接的观测证据.
主要方法:
- 利用一项针对微弱,凉爽的白矮星的调查.
- 根据大太空速度选择的候选人表明光环成员.
- 分析了观测数据,以确认这些白矮星的存在和属性.
主要成果:
- 发现了一大群以前无法检测到的古老,凉爽的白矮星.
- 这些观测到的白矮星对于以前的调查来说太微弱了.
- 新发现的白矮星至少占银河系光环暗物质的2%.
结论:
- 观测到的老白矮星群体提供了对银河系光环暗物质的直接检测.
- 这一发现为暗物质的间接证据提供了自然解释.
- 证实白矮星是银河系看不见物质的重要组成部分.
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