Due to the lapse in federal government funding, NASA is not updating this website.

Suggested Searches

 

Galaxies SIG Seminar

Galaxies Science Interest Group

DATE

May 21, 2025

TIME

11:00 am EST

COMMUNITY

Galaxies SIG

TYPE

Seminar

The Extreme Nature of Galaxies and Stellar Populations at Cosmic Dawn

Harley Katz | University of Chicago

The few years of JWST observations have revealed numerous anomalies at high-redshift such as an unexpected excess of bright galaxies at z>9, peculiar chemical abundance patterns, extreme interstellar medium temperatures, and a population of very early quenched galaxies. These observations have challenged our most state-of-the-art simulations and models of early galaxy formation. In this talk I will highlight the discrepancies between current theory and observations and discuss what physics may need to change to reconcile these surprising results with our understanding of galaxy formation and evolution in the first Gyr. I will then discuss what new data will be needed from existing and future facilities to provide answers to these pressing questions.

Seminar Schedule: Every first Wednesday of the month, 1pm – 2pm ET

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.