Astronomy Colloquium for 2024-02-14

Series: Astronomy Colloquium
Date: Wednesday 14-Feb-2024
Time: 16:05-17:00 (4:05-5:00 pm)
Location: ATL 2400
Speaker: Dr.Jinyi Yang (University of Arizona)
Title: Probing the Early Universe Using the Most Distant Quasars

Quasars at z~7 hosting highly accreting black holes are unique probes for the early Universe, including the growth of the earliest supermassive black holes (SMBHs), the assembly of their massive host galaxies, and cosmic reionization. I have been leading a distant quasar survey, which yielded the largest sample of luminous quasars at z~6.5-7.6. Pre-JWST, studies using this sample have placed stringent constraints on early SMBH growth and the intergalactic medium (IGM) evolution. The launch of JWST opens up a new era. I will introduce my recent effort to conduct high-resolution observations of a sample of ~30 luminous z~7 quasars using JWST and ALMA, in synergy with observations in other wavelengths. This dataset allows us to delve into a comprehensive study of the interactions between early SMBHs and their host galaxies at multiple scales and phases, and enables new methods to constrain the reionization physics. I will present early results, covering early SMBHs, AGN feedback, host galaxy stellar emission, and IGM evolution. These new discoveries mark the beginning of a new era towards understanding the formation of early SMBHs, the assembly of massive host galaxies, and reionization history. With the upcoming next-generation surveys and facilities, the next decade.

In-person colloquia are usually preceded by espresso and ice cream at 1:45 pm outside room PSC 1150 and are followed by an informal reception at 5:15 pm in that room. Anyone interested in talking with the speaker, or being added to the colloquium announcement email list, should contact the colloquium organizer Dr. Leslie Sage. Lunch will normally be reserved for the speaker to talk to graduate students. Anyone asking a question during a talk is asked to raise their hand and be acknowledged before speaking. Contact Dr. Leslie Sage for details.

Colloquium Organizer: Dr. Leslie Sage


Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.


Directions and information about parking can be found here.

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