论文标题
矮星系中的气体动力学作为暗物质和星系进化的测试床
Gas dynamics in dwarf galaxies as testbeds for dark matter and galaxy evolution
论文作者
论文摘要
矮星系是测试暗物质模型和替代理论的理想实验室，因为它们的动力学质量（来自观察到的运动学）在很大程度上超过了其bary子质量（来自气体和恒星）。在大多数恒星形成的矮人中，冷原子气体形成定期旋转的磁盘延伸到恒星成分之外，从而将重力电位探测到最外面的区域。在这里，我回顾了矮星系中气体动力学的几个方面，例如旋转曲线，质量模型和非圆形运动。恒星形成矮人将螺旋星系的动态定律扩展到较低的质量，表面密度和加速度。旋转支持星系的三个主要动力学定律指向三个不同的加速度尺度，它们在不确定性中起着不同的物理作用，但显示出相同的值。这些动力学定律周围的小散射意味着银河系中巴元和暗物质之间的紧密耦合，通过下一代调查将更好地理解，这些调查将通过数量级来扩大当前样本大小。
Dwarf galaxies are ideal laboratories to test dark matter models and alternative theories because their dynamical mass (from observed kinematics) largely outweighs their baryonic mass (from gas and stars). In most star-forming dwarfs, cold atomic gas forms regularly rotating disks extending beyond the stellar component, thus probing the gravitational potential out to the outermost regions. Here I review several aspects of gas dynamics in dwarf galaxies, such as rotation curves, mass models, and noncircular motions. Star-forming dwarfs extend the dynamical laws of spiral galaxies to lower masses, surface densities, and accelerations. The three main dynamical laws of rotation-supported galaxies point to three distinct acceleration scales, which play different physical roles but display the same value, within uncertainties. The small scatter around these dynamical laws implies a tight coupling between baryons and dark matter in galaxies, which will be better understood with next-generation surveys that will enlarge current sample sizes by orders of magnitude.
