Astronomy Colloquium - Xiaohui Fan

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Cassiopeia A supernova remnant
December 5, 2019
4:00PM - 5:00PM
Location
Scott Lab E0040

Date Range
Add to Calendar 2019-12-05 16:00:00 2019-12-05 17:00:00 Astronomy Colloquium - Xiaohui Fan

Extreme Quasars During the Cosmic Dawn

Xiaohui Fan - University of Arizona

The most distant quasars provide unique probes to the formation of the earliest supermassive black holes, the co-evolution of early massive galaxies and their central black holes and the reionization of the intergalactic medium. More than 100 quasars have been discovered at z>6. I will present progress on surveys of the most distant quasars, focusing on three recent discoveries: (1) the most distant quasars known to date at z~7.5-7.6 and the constraint on cosmic reionization history; (2) the most luminous quasar at z>6 powered by a twelve billion solar mass black hole and its implications on the seed of the earliest supermassive black holes; and (3) the first gravitationally lensed quasar during the epoch of reionization and the prospect of direct black hole mass measurements at cosmic dawn.

Scott Lab E0040 Department of Astronomy astronomy@osu.edu America/New_York public
Description

Extreme Quasars During the Cosmic Dawn

Xiaohui Fan - University of Arizona

The most distant quasars provide unique probes to the formation of the earliest supermassive black holes, the co-evolution of early massive galaxies and their central black holes and the reionization of the intergalactic medium. More than 100 quasars have been discovered at z>6. I will present progress on surveys of the most distant quasars, focusing on three recent discoveries: (1) the most distant quasars known to date at z~7.5-7.6 and the constraint on cosmic reionization history; (2) the most luminous quasar at z>6 powered by a twelve billion solar mass black hole and its implications on the seed of the earliest supermassive black holes; and (3) the first gravitationally lensed quasar during the epoch of reionization and the prospect of direct black hole mass measurements at cosmic dawn.