CAREER: Superwinds, Galactic Fountains, and Gaseous Halos in Disk Galaxies

AbstractAST 98- 74973 Veilleux即将进行的研究是对附近盘状星系外围的热电离介质的全面研究。关于这种物质的物理状态、分布和速度结构的知识，对于理解活动星系和正常星系中的大尺度星系风（“超级风”）和喷泉、类星体吸收线系统、宇宙的重子含量、星系的形成和演化以及测量星系中暗物质的质量和分布都是相关的。 附近星系的完整样本将使用最先进的光学法布里-珀罗干涉仪绘制到前所未有的通量水平。 这些数据将提供新的定量约束的气体横截面的星系。 从这些观测中得到的电离气体的形态学和运动学将有助于确定这种物质是否是中性氢气（HI）盘的延伸，星系形成的残余吸积气体，最近星系相互作用的潮汐碎片，或与星系喷泉或超级风有关的气体。星系旋转曲线的数据将使我们能够更好地确定暗物质的分布。 将把暖气体发射线特性数据的结果与盘状星际介质（ISM）的观测数据和激波模型的预测进行比较。 研究生和本科天文学专业将参与这项研究工作。该项目的教育部分涉及开发创新方法，将更多的观测经验引入非理科大学生的课程，并向当地学校的K-12学生提供现代地面天文学的一些经验。 天文活动吸引了所有年龄段的学生。将设计和开发马里兰州大学校园观测站的活动。以探究为基础的学习方法将被用作教育学生的一种手段。现有的实验室天文学本科非科学专业的课程将进行修改，以利用校园天文台的多功能性。 新的重点将放在让本科生直接参与课程材料和学习过程。 望远镜和计算机将用于为非科学专业的课程提供一些基础研究活动。 这些实践活动将帮助学生建立一个理解科学方法的框架，这将有助于他们一生的学习。

AbstractAST 98-74973Veilleux The research to be carried out is a comprehensive study of the warm ionized medium on the outskirts of nearby disk galaxies. The knowledge of the physical state, distribution, and velocity structure of this material is relevant for understanding large-scale galactic winds ("superwinds") and fountains in active and normal galaxies, quasar absorption-line systems, the baryonic content of the universe, the formation and evolution of galaxies, and measuring the mass and distribution of dark matter in galaxies. A complete sample of nearby galaxies will be mapped down to unprecedented flux levels using state-of-the-art optical Fabry-Perot interferometers. These data will provide new quantitative constraints on the gaseous cross-sections of galaxies. The morphology and kinematics of the ionized gas derived from these observations will help determine whether this material is an extension of the neutral Hydrogen gas (HI) disks, remnant-accreting gas from galaxy formation, tidal debris from recent galaxy interactions, or gas associated with galactic fountains or superwinds. Data on the rotation curves of galaxies will allow a better determination of the dark matter distribution. The results from the data on the emission-line properties of the warm gas will be compared with the observational data on the disk interstellar medium (ISM) and with predictions from shock models. Graduate students and undergraduate astronomy majors will be involved in this research effort. The educational component of the project involves developing innovative ways to introduce more observing experiences into the curriculum of non-science university students and to provide K-12 students from local schools with some flavor of what goes on in modern ground-based astronomy. Astronomy activities attract students of all ages. Activities for the University of Maryland campus observatory will be designed and developed. An inquiry based learning approach is to be used as a means of educating the students. The existing laboratory astronomy course for undergraduate non-science majors will be revamped to take advantage of the added versatility of the campus observatory. New emphasis will be put on having undergraduate students directly involved in the course material and the learning process. The telescopes and computers will be used to provide some basic research activities into the curriculum of non-science majors. These hands-on activities will help the students develop a framework for understanding the scientific method that will facilitate learning throughout their lives.