I am leading a JWST Cycle 1 program (61.5 primary hours and 29.6 parallel hours) for studying the promidial environment of the earliest quasars, the formation and growth of the earliest supermassive black holes, the onset of cosmic reionization, and the assembly of the first galaxies.

We are performing a comprehensive [CII] survey of quasar host galaxies at z∼7 with ALMA and NOEMA. The main science goals of this survey are to characterize the star formation activities in the quasar host galaxies and to understand the co-evolution between the SMBHs and their host galaxies.

We are using a customed narrow band filter (NB919) mounted on Magellan/IMACS and public available narrow band filters (NB921 and NB926) on Subaur/HSC to search for Lyman-alpha emitters around quasars at redshift z~6.6. We are also using a narrow band filter FQ937N on Hubble Space Telescope (66 orbits) to study the extended Lyman-alpha halo and small scale environment of quasars at z~6.7.

We are performing a Chandra large program (1740 ks in total) to detect the X-ray emissions from the earliest SMBHs. The main goal is to constrain the accrection rate and the growth history of the first generation billion solar mass black holes.