z～2是宇宙中一个比较特殊的时期，由于观测的限制，对这一时期的研究较少。本项目将基于COSMOS巡天所得到的大视场、多波段高质量测光数据以及zCOMCOS巡天所得到的测谱数据建立一个高置信度的z～2的LBGs样本。研究样本的静止紫外波段光度函数，恒星质量与恒星形成率的关系，恒星质量与静止波长U-B颜色的关系；并将该样本与z～1和z>3的LBGs进行比对，研究其演化特性；与BzK方法选取的sBzK星系进行比对，分析这两类恒星形成星系的异同。本项目的研究结果将有助于进一步了解从本地宇宙到高红移时期星系的恒星形成与演化历史，完善对处于“红移沙漠”中恒星形成星系的演化图像的认识。

It is a particular period of universe at z～2, but a few studies focus on this period because of the observational difficulty. The project will base on the wide field, high quality multiwavelength photometric data from COSMOS and spectroscopic data from zCOSMOS to build a reliable LBGs sample at z～2 using an NUV-dropout technique in combination with color selection. The project will be helpful for further understanding of the galaxy formation and evolution history across the cosmic time by studying the photometric properties of the LBGs sample, such as the rest-frame UV luminosity function, the relationship between star formation rate and stellar mass, the relationship between rest-frame U-B color and the stellar mass, etc.