Collaborative Research: Baryons and dark matter in galaxies

AST-0708185/0709055Klypin/Rhee这是新墨西哥州立大学的Anatoly Klypin博士和内华达大学拉斯维加斯分校的George Rhee博士的合作项目。这将是对星系动力学和结构的广泛观测和理论研究，包括与宇宙学模型进行比较。对星系中心几千秒差距的详细分析是解决标准宇宙模型中观测和理论预测之间的小规模分歧的唯一方法。该项目将研究星系中心区域复杂的气体和恒星运动，使用全尺寸宇宙学模拟和放大技术来解决几个单独的星系，以及“圆盘+凸起+暗物质晕”系统的独立演化。研究人员还将努力改进对与这些中心区域建模相关的不同影响的分析处理。这包括非圆运动、三轴性和不对称性、偏心率的变化、不对称漂移修正和多相气体介质。最后，本研究还包括测量使星系建模复杂化的不同影响的观测，如非圆运动的大小和结构，恒星成分的贡献，以及旧恒星成分的旋转和速度色散。这项工作的结果将提供给过去曾利用该小组图像的传播媒介，并将通过公开讲座进行传播。这些研究将培养研究生成为独立研究者所需的技能，并将他们纳入本科教学。该小组将继续其组织包括理论家和观察员在内的会议的传统。这项工作有助于提高内华达州天文学和科学的总体形象。

AST-0708185/0709055Klypin/RheeThis is a collaborative project between Dr Anatoly Klypin of New Mexico State University and Dr George Rhee of the University of Nevada Las Vegas. It will be an extensive observational and theoretical study of the dynamics and structure of galaxies, and includes confronting these with cosmological models. Detailed analysis of the central few kiloparsecs of galaxies is the only way to settle the small-scale disagreement between observations and theoretical predictions in the standard cosmological model. The project will study complex gas and star motions in the central regions of galaxies using full-scale cosmological simulations with a zoom-in technique for resolving a few individual galaxies, plus separate evolution of 'disk plus bulge plus dark matter halo' systems. The researchers will also work to improve the analytical treatment of different effects relevant for modeling these central regions. This includes non-circular motions, triaxiality and asymmetry, changes in eccentricity, asymmetric drift corrections, and a multi-phase gas medium. Finally, this research includes observations to measure the different effects which complicate the modeling of galaxies, such as the magnitude and structure of non-circular motions, the contribution of the stellar component, and the rotation and velocity dispersion of the old stellar component.Results of the work will be made available to the media, who have in the past made use of this team's images, and will be disseminated through public lectures. The studies will train graduate students in the skills required to become independent researchers, and involve them in undergraduate teaching. The team will continue its tradition of organizing conferences which include both theorists and observers. This work helps to raise the profile of astronomy, and science in general, in Nevada.