US-West Germany Cooperative Research in Galactic Astronomy

该奖项提供了部分支持休假访问 马克斯·普朗克地外物理研究所，慕尼黑，西 德国，代表研究所的J.帕特里克亨利教授 天文学，夏威夷大学。 他将参加一个主要的 德国领导的星系团天文观测， 卫星X射线设备（ROSAT），然后进行跟踪 在夏威夷大学的光学研究。 他的第一本书-- 实验室将是研究所所长Joachim Trumper博士， 研究所的其他工作人员。 ROSAT卫星将在 1990年2月发射。 对整个 预计天空将提供星系团的样本， 将至少是光学选择的最深深度的两倍 样品 ROSAT样本也将具有良好的， 可量化的选择标准，并将在一个连续的区域 天空中。 美国天文学家将有相对较少的机会， 调查数据;亨利教授是为数不多的被邀请 参与调查阶段。 对宇宙中最大结构的研究可以告诉我们 关于它的历史和演变。 加尔维斯敦是典型的 用来研究宇宙的结构 但是， 星系只有在一定的尺度上才是完整的 集群可以提供 一个更大尺度上的结构的粗略概念。 亨利教授会 能够将位置集群的数据转发给夏威夷的观测者。 他和他的同事们将重点研究 团簇的x射线和光学性质，大尺度结构， 经典的红移关系。 它的深度和完整性- ROSAT样本的完整性将使这些研究能够产生 比以前的工作有了很大的改进。

This award provides partial support for a sabbatical visit to the Max Planck Institute for Extraterrestrial Physics, Munich, West Germany, for Professor J. Patrick Henry of the Institute for Astronomy, University of Hawaii. He will participate in a major German-led astronomical survey of clusters of galaxies using satellite based x-ray equipment (ROSAT), and then conduct followup optical studies at the University of Hawaii. His primary col- laborators will be the Institute Director, Dr. Joachim Trumper, and others on the Institute staff. The ROSAT satellite was to be launched in February, 1990. The x-ray imaging survey of the entire sky is expected to provide a sample of clusters of galaxies which will be at least twice as deep as the deepest optically selected samples. The ROSAT sample will also have well established, quantifiable selection criteria and will be in a contiguous region of the sky. U.S. astronomers will have relatively little access to survey data; Professor Henry is one of very few invited to participate in the survey phase. The study of the largest structures in the universe can tell us much about its history and evolution. Galaxies are classically used to investigate structure in the universe. But surveys of galaxies are only complete to a certain scale. Clusters can give a rough idea of structure on a much larger scale. Professor Henry will be able to relay data on position clusters to observers in Hawaii. He and his colleagues will emphasize studies of the evolution of cluster x-ray and optical properties, large scale structure, and the classical magnitude redshift relation. The depth and complete- ness of the ROSAT sample will enable these studies to produce significant improvements over previous work.