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April 22, 2026

Stellar associations powering H

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Authors

FSFabian ScheuermannKKKathryn KreckelJTJia Wei Teh

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Overview

Observational analysis measures ionizing radiation leakage in nearby galaxies, suggesting improved energy insights.

Key Points

  • This research aims to quantify how much ionizing radiation from newly formed stars escapes into the surrounding gas in galaxies.
  • Matched H II regions from PHANGS–MUSE with their ionizing stellar sources from PHANGS–HST.
  • Measured photon escape fraction for ionizing radiation in a sample of 19 nearby galaxies.
  • Aggregated ionization budgets over entire galaxies for a comprehensive analysis.
  • Measured a photon escape fraction of 82−24+12% for ionizing radiation in H II regions.
  • Identified up to 20% of cases where the stellar source was insufficient to account for observed H α flux.
  • Found that some ionizing photons come from stars outside the H II boundaries, warranting a galaxy-wide approach.

Cite This Study

Scheuermann et al. (2026) studied this question.

synapsesocial.com/papers/69e865b56e0dea528ddea315https://doi.org/10.1051/0004-6361/202556811/pdf
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