Galaxies SIG Seminar, 6 Oct 2026
A Galaxy Doesn’t Forget: Why You Should Trust Your Resolved SFHs from Photometric Observations. Speaker: Charlotte Olsen (CUNY City Tech) The post Galaxies SIG Seminar, 6 Oct 2026 appeared first on NASA Science .
The Cosmic Origins Community Galaxies SIG Seminar took place on October 6, 2026, at 1:00 PM ET, virtually. The seminar's focus was on the importance of trusting resolved star formation histories (SFHs) derived from photometric observations, even for galaxies that do not forget their past. The speaker, Charlotte Olsen from CUNY City Tech, utilized the well-validated h277 Milky-Way-mass cosmological zoom simulation to compare the actual radial distribution of star formation with the distribution inferred from resolved SFHs up to a lookback time of 1.6 billion years.
By measuring migration rates in annuli matched to typical spaxel scales, Olsen found that resolved SFHs could consistently recover the radial profiles' slope and relative shape up to 1 Gyr lookback time. This highlights the reliability of photometric observations in uncovering galaxy growth and quenching processes.
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