Discovery and Dynamics of Very Low Surface Brightness Galaxies

AST0206078McGaughd.马里兰大学的Stacy McGaugh将对构成我们知识前沿的低表面亮度(LSB)星系群进行双管齐下的调查。一方面是对本地“超”LSB星系进行的大规模、非常深入的调查的分析。这次调查的数据是存在的，McGaugh博士现在将处理和分析这些数据。该项目的第二个方面是获取和分析已知LSB星系的高精度、高空间分辨率的旋转曲线。这个话题已经变得令人兴奋和有争议，因为它在测试冷暗物质结构形成模拟中可能起着关键作用。这样的模拟预测了带有尖点的暗物质光晕，这很难与迄今的观测结果相一致。已经就这一问题提出了一些悬而未决的问题，这就产生了对关于这一主题的更多和更好的数据的巨大需求。

AST 0206078McGaughDr. Stacy McGaugh, at the University of Maryland, will carry out a two-pronged investigation of the low surface brightness (LSB) galaxy population which constitutes the frontier of our knowledge. One aspect is the analysis of a large, very deep survey for local "ultra" LSB galaxies. The data forthis survey exist, and Dr. McGaugh will now process and analyze these data The second aspect of this project is the acquisition and analysis of high accuracy, high spatial resolution rotation curves of known LSB galaxies. This topic has become exciting and controversial because of its potentially pivotal role in testing cold dark matter structure formation simulations. Such simulations predict dark matter halos with cusps which are difficult to reconcile with the observations to date. A number of outstanding questions have been raised over this issue, creating an enormous demand for more and better data on this subject.***