Fig. 6.

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Dependence of the Lyα velocity offset on EW(Lyα) (top left), MUV (top right), [O III]/[O II] ratio (O32) (bottom left) and EW(Hβ) (bottom right). In these plots, we show the correlations between quantities derived using only our JADES sample as the thicker, darker dashed line, and those derived using the extended LAE sample with the thinner, lighter dashed line, with p-values given for both. We find an anti-correlation between Lyα velocity offset and EW(Lyα), which is likely driven by the neutral gas content in the galaxy, whereby a larger reservoir of neutral gas both attenuates Lyα flux close to the systemic velocity as well as moves the apparent peak of the emission line away from systemic velocity due to resonant scattering of Lyα photons. Lyα emission from UV-fainter LAEs also peaks closer to the systemic redshift, which is indicative of decreasing neutral gas content at fainter luminosities/galaxy masses. No strong correlations exist between Lyα offset and O32 ratios or EW(Hβ), interestingly with three low Lyα velocity offset sources showing low (< 3) O32 ratios.
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