An Empirical reionization history model inferred from the low-redshift Lyman continuum survey and the star-forming galaxies at $z>8$

Understand

We present a new analysis of the rest-frame UV and optical spectra of a sample of three $z>8$ galaxies discovered behind the gravitational lensing cluster RX\,J2129.4+0009.

• We combine these observations with $z>7.5$ galaxies from the literature, for which similar measurements are available.
• As already pointed out in other studies, the high [\oiii]$\lambda$5007/[\oii]$\lambda$3727 ratios ($O_{32}$) and steep UV continuum slopes ($\beta$) are consistent with the values observed for low redshift Lyman continuum emitters, suggesting that such galaxies contribute to the ionizing budget of the intergalactic medium.
• We construct a logistic regression model to estimate the probability of a galaxy being a Lyman continuum emitter based on the measured \MUV, $\beta$, and $O_{32}$.