The Synchrony of Production & Escape: Half the Bright Ly$\alpha$ Emitters at $z\approx2$ have Lyman Continuum Escape Fractions $\approx50\%$

Understand

The ionizing photon escape fraction (LyC $f_{\rm{esc}}$) of star-forming galaxies is the single greatest unknown in the reionization budget.

• Stochastic sightline effects prohibit the direct separation of LyC leakers from non-leakers at significant redshift.
• Here we circumvent this uncertainty by inferring $f_{\rm{esc}}$ with resolved (R>4000) LyA profiles from the X-SHOOTER LyA survey at z=2 (XLS-z2).
• We select leakers ($f_{\rm{esc}}>20$%) and non-leakers ($f_{\rm{esc}}<5$%) from a representative sample of $>0.2 L^{*}$ LyA emitters (LAEs).