| 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. |
