来源:本站 作者: 发布时间:2018-06-17
题目：MeV Gamma-ray Astronomy and the Compton Spectrometer and Imager (COSI) Project
报告简介：MeV gammaray astronomy is a relatively poorly explored field, mainly because of the low sensitivity of instruments to measured MeV photons. The Compton Spectrometer and Imager (COSI) project is an effort to develop the next generation Compton telescope of higher sensitivity.COSI is currently a balloon-borne telescope project. The heart of COSI is an array of12 cross-strip germanium detectors, each with 15mm x 80mm x 80mm dimension and full 3D position resolution of less than 2 cubic millimeter. COSI performs Compton spectroscopic imaging in the 0.2-10 MeV gammay-ray band with a field of view about 50 degrees across and capability of polarization measurement. It is also well suitable for monitoring transient events. Several COSI balloon flights have been conducted. The most recent flight was launched from Wanaka, New Zealand, in May 2016 with a superpressure balloon flying for 47 days. During this flight, COSI discovered GRB160530A and detected several sources, including the 511keV emission from the galactic center, the Crab, Cen A, and Cyg X. The COSI collaboration is now working for the next flight in spring 2019, to launch again from Wanaka, New Zealand, for a 100 day flights. I will report the current status of the COSI project. COSI is a join effort of several institutions in Taiwan, US and France.
报告人学术背景及科研方向简介：Professor Hsiang-Kuang Chang received his bachelor degree in Physics from Tsing Hua University, Taiwan in 1987. He earned his Ph.D. degree in Astronomy in Bonn University, Germany. And then he worked as a postdoctoral research associate Los Alamos National Laboratory in the USA. He becomes a faculty in Tsing Hua University in 1997. His research interest consists of pulsars, soft gamma repeaters X-ray binaries, Galactic 511 keV emission, Active Galactic Nuclei, Gamma Ray Bursts, white dwarf, trans-Neptunian Objects as well as Compton Spectrometer and Imager(COSI). The breakthrough researches includes opening a new method to identify the Trans-Neptunian Objects, the nature of X-ray pulsars, GRB, AGN as well as the searches of Galactic 511 keV emission. He had served as chair in Department of Physics, director of Institute of Astronomy, Associate Vice President for Academic Affairs, Vice President for General Affairs in Tsing Hua University. In addition, he was the President of Astronomical Society of the Republic of China. Prof. Wong currently serves as the leader in Taiwan for the international COSI Program