APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Xue-Bing Wu (KIAA , Peking U)
Title: Ultraluminous quasars with the most massive black holes at cosmic dawn
Date (JST): Thu, Feb 02, 2017, 13:30 - 14:30
Place: Seminar Room A
Abstract: High-redshift quasars are important tracers of the structure and evolution in the early Universe. We have developed new methods to select high-redshift quasars with both high efficiency and completeness by combining optical and infrared photometric data, and are conducting a spectroscopic survey of luminous high-redshift quasars. I will report recent discoveries of about one hundred high-redshift quasars in our survey. Some ultra-luminous quasars with more than 10 billion solar mass black holes present serious challenges to the theories of black hole growth and the black hole/galaxy co-evolution at cosmic dawn, when the Universe was younger than 1 billion years after the Big Bang.