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Galaxies SIG Seminar

Galaxies Science Interest Group

DATE

June 18, 2025

TIME

11:00 am EST

COMMUNITY

Galaxies SIG

TYPE

Seminar

Enhance! Spatially-Resolving Sub-kpc Physics Within High-z Galaxies

Taylor Hutchison, NASA / GSFC

With the advent of JWST, we have witnessed an explosion of science in the early Universe — with recent results unveiling the conditions for the earliest births and deaths of star-formation in nascent galaxies. Prior to JWST, our understanding of the chemical landscape of early star-formation was largely limited to integrated measurements across the entire galaxy. With the sensitivity, wavelength coverage, and resolution of JWST, we are finally able to fully leverage the power of spatially-resolved spectroscopy to study individual clumps of star formation in lensed galaxies across cosmic time to exquisite spatial detail. In this talk, I will share work from several ERS, Cy1, and Cy2 programs targeting distant galaxies and spatially-resolved spectroscopy of highly-magnified clumpy galaxies across the peak of cosmic star formation and into the reionization era. I will highlight how we can map the physical conditions of early galaxies on sub-kpc scales, thus allowing us to trace the spatial variation of key properties (i.e., stellar ages, gas density, metallicity) across the extent of individual galaxies and even individual star-forming clumps. Finally, I will discuss the synergies between these observations and the potential future capabilities of HWO.

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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.