Probing Cosmological Parameters and Cluster Gas Physics through Measurements of the Sunyaev-Zel'dovich Spectrum

星系团是优秀的宇宙探测器，能够测量宇宙的质量分布和膨胀的动力学。Sunyaev-Zel'dovich效应（SZE）是指宇宙微波背景（CMB）光子被星系团中的热气体反向散射，通过测量该效应可以确定星系团的特殊速度，而不需要经验距离指示器。这项研究将继续Sunyaev-Zel'dovich红外实验（SuZIE），使用具有额外频率覆盖的新接收器，能够更快，更高精度的测量。这项研究将测量100个星团，确定密度参数和CMB的温度变化作为红移的函数。接收机将可用于其他可使用其多频率能力的调查。参与SuZIE的学生将学习最先进的仪器技术，包括光学和电子设计和制造。这项研究将继续涉及本科生，在过去，其中一半以上是女性。该团队还将继续进行公开演讲，并参加斯坦福大学的学生和教师项目。

AST-0407212ChurchGalaxy clusters are excellent cosmological probes, capable of measuring both the mass distribution in the universe and the dynamics of its expansion. Measurement of the Sunyaev-Zel'dovich effect (SZE), which is the inverse scattering of cosmic microwave background (CMB) photons by hot gas in clusters, determines cluster peculiar velocities without the need for empirical distance indicators. This research will continue the Sunyaev-Zel'dovich Infrared Experiment (SuZIE), using a new receiver with additional frequency coverage, capable of faster, higher precision measurements. The study will measure 100 clusters, determining the density parameter and the variation of the temperature of the CMB as a function of redshift.The receiver will be available for other investigations that can use its multi-frequency capabilities. Students involved with SuZIE will learn start-of-the-art instrumental techniques, including optical and electronics design and fabrication. The research will continue to involve undergraduates, and in the past more than half of them have been women. The team will also continue giving public talks and participating in Stanford high school programs for students and teachers.