Suggested Searches

 

AGN SIG Seminar

Active Galactic Nuclei Science Interest Group

DATE

Sep 13, 2022

TIME

12:00 pm EST

COMMUNITY

AGN SIG

TYPE

Seminar

Measuring AGN Hosts Properties at z > 3 with JWST

Dale Kocevski

AGN have become key components of most galaxy evolution models, yet several open issues remain in our understanding of how the link between galaxies and their SMBHs is established and maintained. Among these are the mechanism(s) responsible for fueling the bulk of SMBH growth across cosmic time and the role that AGN play in quenching the star formation activity of the first generation of massive quiescent galaxies. I will present recent results from the CEERS survey, which is using the James Webb Space Telescope (JWST) to determine the morphologies and stellar populations of AGN hosts at z > 3 for the first time. Surprisingly, we find AGN hosts at these redshifts have optical colors consistent with a quenched or post-starburst stellar population. The presence of AGN in passively evolving galaxies at z > 3 is significant because a rapid feedback mechanism is required in most cosmological simulations to explain the growing population of massive quiescent galaxies observed at these redshifts. I will also discuss what the morphologies of these galaxies tell us about the processes driving their nuclear activity.

Find the schedule and list of speakers on our website.

News Straight to Your Inbox

Subscribe to your community email news list

We will never share your email address.

Privacy Policy

Sign Up
An illustration of Sun-like star HD 181327 and its surrounding debris disk. The star is at top right. It is surrounded by a far larger debris disk that forms an incomplete ellpitical path and is cut off at right. There’s a huge cavity between the star and the disk. The debris disk is shown in shades of light gray. Toward the top and left, there are finer, more discrete points in a range of sizes. The disk appears hazier and smokier at the bottom. The star is bright white at center, with a hazy blue region around it. The background of space is black. The label Artist's Concept appears at lower left.