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Galaxies SIG Seminar

Galaxies Science Interest Group

DATE

Apr 17, 2024

TIME

1:00pm

COMMUNITY

Galaxies SIG

TYPE

Seminar

Understanding the Production and Escape of Ionizing Photons – Far-UV Science with HWO

Anne Jaskot

JWST is transforming our knowledge of galaxy properties at z > 6, but one property it cannot observe is the emission of ionizing, Lyman Continuum (LyC) photons from these galaxies. At high redshifts, these LyC photons are absorbed by the IGM en route to Earth. Yet studying LyC radiation is critical to understand how galaxies reionized the IGM and how massive stars affect their host galaxy’s ISM. We need to know how LyC radiation is produced within galaxies and with what energies, what processes enable its escape into the IGM, and how much LyC radiation escapes from different types of galaxies. Recent LyC observations of low-redshift galaxies with HST have begun to answer these questions but are limited to moderately bright (MUV -18 to -21) galaxies at z ~ 0.3 with limited spatial information. I will review what we’ve learned from these HST observations as well as the open questions that remain. I will discuss how future FUV science with HWO at higher spatial resolution, higher sensitivity, or shorter wavelengths could provide important insights into low-metallicity super star clusters, their effects on the ISM, and the reionization of the universe.

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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.