Dark Halos of Galaxies

星系的暗晕

• 批准号: 8715533
• 负责人: George Lake
• 金额: $ 6.98万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-15 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8715533&HistoricalAwards=false
• 关键词: Dark; Halos; Galaxies

There are observational data that can be explained more easily if there is non-luminous (dark) matter in galaxies. The effects of the dark matter can be studied by comparing the theoretical models with observations. This research is to study the effects of dark matter and the research plan is divided into four basic topics: - An observational study of NGC5666 - an elliptical galaxy with a disk of gas that provides a unique opportunity for the study of the mass distribution of an elliptical galaxy. - Observations of the rotation curves of dwarf galaxies. - A broad look at modeling dark halos of galaxies. The results of careful fitting of existing data will be shown. These techniques will be used to fit the new observational material. The need to include "core pulling" in detailed models will be shown. While these phenomena have been generically described by a number of investigators, they have not yet been incorporated in model building. - Simulations of the evolution of the expansion and recollapse of a protogalaxy. The common theme that unites these projects is that they are all aimed at determining the form and distribution of dark matter. The simulations are needed to relate these quantities to the properties of dark matter at the time of galaxy formation and at still earlier times. Finally the research will give results about galaxy halos: Are they cold, warm or hot? Are uniformities in properties due to nature or nurture?

如果星系中存在不发光（暗）物质，那么观测数据可以更容易地解释。暗物质的影响可以通过比较理论模型和观测结果来研究。本研究是研究暗物质的效应，研究计划分为四个基本课题：-对NGC5666的观测研究——一个带有气体盘的椭圆星系，为研究椭圆星系的质量分布提供了一个独特的机会。-矮星系旋转曲线的观测。-对星系暗晕建模的广泛观察。将显示对现有数据仔细拟合的结果。这些技术将用于拟合新的观测材料。将说明在详细模型中包括“抽芯”的必要性。虽然这些现象已经被许多研究者普遍地描述过，但它们还没有被纳入模型构建中。-模拟原星系膨胀和坍缩的演化过程。这些项目的共同主题是，它们都旨在确定暗物质的形式和分布。模拟需要将这些数量与星系形成时以及更早时期暗物质的特性联系起来。最后，这项研究将给出关于星系晕的结果：它们是冷的、热的还是热的？属性的一致性是天生的还是后天的？