Young galaxies in the early universe are expected to be strong Lyα emitters (LAEs), and can be selected with high efficiency via narrowband imaging. The neutral hydrogen atoms in the IGM scatter/attenuate the Lyα emission from primordial galaxies, making LAEs a sensitive probe to cosmic reionization. I will give an introduction to the field, briefly review world-wide progresses, and present our own project “Lyman Alpha Galaxies in the Epoch of Reionization” (LAGER), an international collaboration in searching for LAEs at redshift of ~ 7.0 with large area Dark Energy Camera narrowband survey.

Bio: Junxian Wang obtained his PhD from the University of Science and Technology of China in 2001. He stayed at Johns Hopkins University as a postdoc for 3 years, and then was appointed to a faculty position at USTC in 2004. He was awarded the 2009 “Huang ShouShu” Award for excellence in science by the Chinese Astronomical Society. He is now leading a research group at USTC working on high redshift galaxies, cosmic reionization, and active galactic nuclei.