Wu leads a team that has developed a method to effectively select quasars in the distant universe based on optical and near -
infrared photometric data, in particular using data from the Sloan Digital Sky Survey and NASA's Wide - Field Infrared Explorer, or WISE, satellite.
This publication makes use of
data products from the Widefield
Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles; the Jet Propulsion Laboratory / California Institute of Technology, which is funded by NASA; the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the
Infrared Processing and Analysis Center / California Institute of Technology, funded by NASA; and the American Association of Variable Star Observers (AAVSO)
Photometric All - Sky Survey (APASS), whose funding is provided by the Robert Martin Ayers Sciences Fund and the AAVSO Endowment (https://www.aavso.org/aavso-
photometric-all-sky-survey-
data-release-1).