Satellites and Dwarf Galaxies as Probes of Dark Matter

这个项目在小尺度上解决了所谓的宇宙学危机，使用了孤立星系的卫星，附近空洞中的星系，以及详细的旋转曲线模型。将观测分析与理论相结合，将使用补充和扩展传统方法的方法。利用斯隆数字巡天数据，对卫星星系运动学进行全面的贝叶斯概率分析，将探测孤立星系外围区域的质量分布（主要是暗物质）。危机的一个相关部分，附近空洞的星系内容，将在大的星等范围内用浅层样本进行分析，然后将其与宇宙学模拟进行比较。最后，从旋转曲线重建质量轮廓的准确性必须取决于星系类型，微小的变化会显著影响质量估计。因此，目前的研究包括制作嵌入现实宇宙暗物质晕的盘状星系的公开可用模型。其目的是提高卫星动力学结果的质量和可靠性，并在此过程中培训两名女研究生，并向整个社区提供目录和数值模型。

AST-0407072KlypinThis project addresses the so-called crisis in cosmology on small scales, using satellites of isolated galaxies, galaxies in nearby voids, and detailed models of rotation curves. Combining the analysis of observations with theory, methods will be used that complement and expand the traditional approach. A full scale Bayesian probabilistic analysis of satellite galaxy kinematics, using the Sloan Digital Sky Survey data, will probe the (mainly dark matter) mass distribution in the peripheral regions of isolated galaxies. A related part of the crisis, the galaxy content of nearby voids, will be analyzed with shallow samples over a large magnitude range, which will then be compared with cosmological simulations. Finally, the accuracy of the reconstruction of mass profiles from rotation curves must depend on galaxy type, and small variations can significantly mar the mass estimates. Therefore, the present research includes the production of publicly available models of disk galaxies embedded in realistic cosmological dark matter halos. The intent is to raise the quality and reliability of results coming from satellite dynamics, and along the way train two female graduate students and provide catalogs and numerical models to the entire community.