Suppressing Dwarf Galaxy Formation with Gravitational Pancakes

用引力煎饼抑制矮星系的形成

• 批准号: 0607535
• 负责人: Houjun Mo
• 金额: $ 29.29万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-15 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607535&HistoricalAwards=false
• 关键词: Suppressing; Dwarf; Galaxy; Formation; Gravitational

The Principal Investigator and his collaborators will investigate a promising alternative to popular cold dark matter models of galaxy formation, a model in which the medium around low-mass halos is preheated by the formation of pancakes (sheet-like cosmic structures). Cold dark matter models in general predict too many low-mass dark matter halos compared to the observed number density of galaxies. A preliminary analysis suggests that the formation of massive pancakes may precede that of low-mass halos and heat the intergalactic medium, and demonstrates that such a process can have a significant effect on the number of dwarf galaxies. N-body simulations and analytical models will be used to study in detail the relationship between halo progenitors and the pancakes within which the halos form. Full hydrodynamical simulations will be carried out to quantify directly preheating by gravitational pancaking and its effect on gas accretion into galaxy halos. The results will provide new avenues for interpreting observations from major observational programs, both ground- and space based. The proposed projects also provide multidisciplinary training opportunities for graduate students, and help promote public interest in programs supported by the National Science Foundation and other funding agencies.

首席研究员和他的合作者将研究一种有希望的替代流行的冷暗物质星系形成模型的模型，在该模型中，低质量晕周围的介质通过形成煎饼（片状宇宙结构）而预热。与观测到的星系数密度相比，冷暗物质模型通常预测了太多的低质量暗物质晕。初步分析表明，大质量薄饼的形成可能先于低质量晕的形成，并加热星系际介质，并表明这样的过程可能对矮星系的数量产生重大影响。N体模拟和分析模型将被用来详细研究晕祖细胞和其中的晕形成煎饼之间的关系。将进行完整的流体动力学模拟，以量化引力煎饼的直接预热及其对气体吸积到星系晕中的影响。这些结果将为解释地面和空间主要观测项目的观测结果提供新的途径。拟议的项目还为研究生提供多学科培训机会，并有助于促进公众对国家科学基金会和其他资助机构支持的项目的兴趣。