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Galaxies SIG Seminar

Galaxies Science Interest Group

DATE

June 4, 2025

TIME

11:00 am EST

COMMUNITY

Galaxies SIG

TYPE

Seminar

Resolving Galaxy Evolution Across Space, Time, and Wavelength with HWO

Kartheik Iyer, Columbia Univ., Hubble Fellow

HWO's exceptional angular resolution and wavelength coverage will enable detailed reconstruction of star formation histories (SFHs) for an unprecedented number of galaxies across cosmic time. I will present a spatiotemporal framework combining non-parametric SFH methods (Dense Basis; GP-SFH) with interpretable machine learning (Katachi) to extract both evolutionary timescales and spatial signatures of physical processes regulating galaxy growth from multiwavelength observations. In conjunction with suites of simulations like CAMELS, approaches like this can be used to disentangle and constrain the role of feedback in creating the incredible diversity of galaxies we see today. These methods can be applied to currently open questions in galaxy evolution including: (1) understanding the link between SFHs and galaxy morphology up to cosmic noon, (2) constraining star formation and quenching timescales through spatially-resolved SFHs, and (3) using star formation stochasticity to probe the role of feedback in shaping galaxies. HWO's capabilities will provide the statistical power needed to definitively test theoretical models of galaxy formation through this spatiotemporal lens.

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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.