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Indirect diagnostics of Lyman continuum (LyC) escape are needed to constrainwhich sources reionized the universe. We used Mg II to predict the LyC escapefraction (fesc(LyC)) in 14 galaxies selected from the Hobby-Eberly TelescopeDark Energy Experiment solely based upon their Mg II properties. Using the LowResolution Spectrograph on HET, we identified 7 and 5 possible LyC leakersdepending on the method, with fesc(LyC) ranging from 3 to 80%. Interestingly,our targets display diverse [O III]/[O II] ratios (O32), with strong inferredLyC candidates showing lower O32 values than previous confirmed LyC leakersamples. Additionally, a correlation between dust and fesc(LyC) was identified.Upcoming Hubble Space Telescope/Cosmic Origins Spectrograph LyC observations ofour sample will test if Mg II and dust are predictors of fesc(LyC), providinginsights for future JWST studies of high-redshift galaxies.

Using Mg II Doublet to Predict the Lyman Continuum Escape Fraction from 14 HETDEX Galaxies