报告题目：The Urumqi survey for rapid variability in compact radio sources

　　报告人：  助理研究员 刘俊

　　Abstract：In the cm-regime rapid flux density variations on timescales of the order of a day or less (Intra-Day Variability, IDV) are frequently seen in compact flat spectrum radio sources. Aiming at study the origin of such rapid variability, we initiated a project to monitor a large sample of compact flat spectrum radio sources which were selected from the CRATES catalog of Healey et al (2007). From this catalog we monitored 446 northern sky radio sources with the Urumqi 25m radio telescope at 5 GHz with dense time sampling. The scientific purpose of this project is a statistical study for a large sample of IDV sources with the aim to search for possible correlations between IDV and source properties (gamma-ray loudness, redshift) and correlations between source position on the sky and fore-ground emission. In this talk I will present and discuss the statistical results of the project. 

　　报告时间：11月13日（周四）上午11：00 

　　报告地点：台本部110会议室 

　　联系人：丁振      0991-3689231