Collaborative Research: Baryons and Dark Matter in Galaxies

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博士合作的项目。它将对星系的动力学和结构进行广泛的观测和理论研究，并包括与宇宙学模型对峙。在标准宇宙模型中，解决观测和理论预测之间的小尺度分歧的唯一方法是详细分析星系的中心几个千节。该项目将使用全尺寸宇宙学模拟来研究星系中心区域的复杂气体和恒星运动，并使用放大技术来解析几个单独的星系，以及单独演化的“圆盘+凸起+暗物质晕”系统。研究人员还将致力于改进对与这些中心区域建模相关的不同影响的分析处理。这包括非圆周运动、三轴性和不对称性、偏心率变化、不对称漂移修正和多相气体介质。最后，这项研究包括观测，以测量使星系建模复杂化的不同影响，如非圆周运动的大小和结构，恒星组件的贡献，以及旧恒星组件的自转和速度分散。工作结果将提供给媒体，他们过去曾使用该团队的图像，并将通过公开讲座传播。这些研究将培训研究生成为独立研究人员所需的技能，并让他们参与本科教学。该团队将继续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整个科学的知名度。

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.