High redshift galaxy surveys

摘要

A brief overview on the current status of the census of the early universe population is given. Observational surveys ofhigh redshift galaxies provide direct opportunities to witness the cosmic dawn and to have better understanding of howand when infant galaxies evolve into mature ones. It is a much more astronomical approach in contrast to the physicalapproach of to study the spatial fluctuation of cosmic microwave radiation. Recent findings in these two areas greatlyadvanced our understanding of the early Universe. I will describe the basic properties of several target objects we arelooking for and the concrete methods astronomers are using to discover those objects in early Universe. My talk starts with Lyman a emitters and Lyman break galaxies, then introduces a clever approach to use gravitational lensing effect of clusters of galaxies to detect distant faint galaxies behind the clusters. Finally I will touch on the status and prospects ofsurveys for quasars and gamma-ray bursts.