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Galaxies SIG Seminar

Galaxies Science Interest Group

DATE

April 16, 2025

TIME

11:00 am

COMMUNITY

Galaxies SIG

TYPE

Seminar

On the Escape Fraction of Ionizing Radiation, Lessons Learned and Outstanding Questions

Claudia Scarlata, Univ. of Minnesota

The escape fraction of ionizing radiation from galaxies is a fundamental parameter that can be accurately measured only in the local universe. However, it is at high redshift, during the epoch of cosmic reionization, that understanding this value is most critical. While the JWST is providing unprecedented characterization of the galaxy population at these early times, direct measurements of the escape fraction remain impossible. In this presentation, I will review recent advances in our understanding of the escape fraction in the local universe and highlight several outstanding questions regarding the mechanisms that facilitate the escape of ionizing radiation, as well as the evolution of this process over cosmic time.

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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.