The Effect of Radiation and Supernovae Feedback on LyC Escape in Local Star-forming Galaxies

Cody A. Carr,Renyue Cen，Anne Verhamme,Gábor Worseck

The Astrophysical Journal（2025）SCI 2区SCI 3区

Cited 0|Views16

Abstract

Feedback is widely recognized as an essential condition for Lyman continuum (LyC) escape in star-forming galaxies. However, the mechanisms by which galactic outflows clear neutral gas and dust remain unclear. In this paper, we model the Mg II 2796Å, 2804Å absorption + emission lines in 29 galaxies taken from the Low-z LyC Survey (LzLCS) to investigate the impact of (radiation + mechanical) feedback on LyC escape. Using constraints on Mg^+ and photoionization models, we map the outflows' neutral hydrogen content and predict f_esc^LyC with a multiphase wind model. We measure mass, momentum, and energy loading factors for the neutral winds, which carry up to 10 SED template fitting to determine the relative ages of stellar populations, allowing us to identify radiation feedback dominant systems. We then examine feedback related properties (stellar age, loading factors, etc.) under conditions that optimize feedback efficiency, specifically high star formation rate surface density and compact UV half-light radii. Our findings indicate that the strongest leakers are radiation feedback dominant, lack Mg II outflows, but have extended broad components in higher ionization lines like [O III] 5007Å, as observed by Amorín et al. (2024). In contrast, galaxies experiencing supernovae feedback typically exhibit weaker f_esc^LyC and show evidence of outflows in both Mg II and higher ionization lines. We attribute these findings to rapid or "catastrophic" cooling in the radiation-dominant systems, which, given the low metallicities in our sample, are likely experiencing delayed supernovae.

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Key words

Circumgalactic medium,Neutral hydrogen clouds,Ultraviolet astronomy,Galactic winds,Reionization,Interstellar medium

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