Streams in the Galactic Halo

密歇根大学马里奥分校AST-9820608DR.Mateo和Arabadjis将开展一项观测和理论研究计划，以确定和表征银晕中不同结构或流的详细性质。这些流被认为是矮小星系的残余物，这些星系因与银河系的相互作用而受到潮汐破坏。该观测计划依赖于PI开发的一种技术来识别和研究极低表面亮度水平的气流。他们将把这项技术应用于进一步研究附近最近发现的Sgr矮星系，以及麦哲伦流，以及PI和其他人正在进行的搜索中发现的其他残留物特征。他们将在这些光度搜索之后进行速度研究。该项目的理论部分包括尝试模拟卫星星系的分裂，并结合使用N体和平滑粒子流体动力学技术来描述潮汐碎片在整个银晕中的大范围分布。

Mateo, MarioUniversity of MichiganAST-9820608Drs. Mateo and Arabadjis will carry out an observational and theoretical research program to identify and characterize the detailed properties of distinct structures, or streams, in the galactic halo. These streams are thought to be the remnants of dwarf galaxies that have been tidally disrupted through interactions with the Milky Way galaxy. The observational program relies on a technique developed by the PI to identify and study streams at extremely low surface brightness levels. They will apply this technique to further study of the nearby, recently discovered Sgr dwarf galaxy, and to the Magellanic Stream, as well as other remnant signatures that are identified in ongoing searches by the PI and others. They will follow these photometric searches with velocity studies. The theoretical portion of the project involves attempts to model the disruption of the satellite galaxies, and to produce a description of the large-scale distribution of tidal debris throughout the galactic halo using a combination of N-body and smoothed particle hydrodynamics techniques.