本项目将在CANDELS巡天的5个天区内，通过深度紫外和Herschel波段选的方法，结合从紫外到红外的高精度多波段测光和光谱观测资料，建立处于“红移沙漠”z～1－2的恒星形成星系样本，即红移z～1和z～2的Lyman break星系以及z～1－2的红外选亮（恒星形成）星系样本；在充分理解选择效应和完备性的基础上深入开展样本测光性质的统计研究，如恒星形成率、恒星质量、本地紫外光度函数和downsizing效应等；同时结合CANDELS的成像观测，详细分析样本星系的形态结构特征，如星系恒星形成和恒星的分布、大小和中心聚度以及星系从“蓝云”(blue cloud)到“红序”(red sequence)的演化等；在项目完成时以期对处于“红移沙漠”中的星系演化有更深刻的了解，进而对整个星系形成和演化的框架体系加以丰富和发展。

Galaxies in the redshift desert, i.e., 1.5 ≤ z ≤ 2.5, play a key role in understanding the whole paradigm of galaxy formation and evolution at present day. Based on the selections of FUV- and NUV-drops, and IR flux limit observed by Herschel, samples of star forming galaxies at redshift z ～1－2 will be established in the five fields of CANDELS survey. Photometric redshifts of individual sample galaxies will be obtained by their SED fittings, adopting multi-wavelength data from ultraviolet to IR. Photometric properties will be investigated, including their star formation rates, stellar masses, the UV luminosity function and the downsizing effect. Together with the CANDELS data, structures of star formation activities and stars of sample galaxies with images available will be studied to get their structure parameters, such as sizes and concentrations. The evolutionary paths of sample galaxies, i.e., how they evolve from the blue cloud to the red sequence, will be discussed. After the project, the evolution of galaxies in the redshift desert is designed to be better understood, which will be helpful to the whole framework of galaxy formation and evolution.