side ($\sigma_{\rm red}/\sigma_{\rm blue}= 19.5^{+0.2}_{-19.3}$).

Assuming the line is Ly$\alpha$, the implied redshift (based on the line centroid defined as the wavelength of the peak of the Ly$\alpha$ emission) is $z({\rm Ly\alpha})= 7.6637 \pm 0.0011$,[^2] placing it as presently the third most distant spectroscopically confirmed galaxy via Ly$\alpha$ and the only galaxy at $z>7$ in the GOODS-S field with a significant Ly$\alpha$ detection. The photometric redshift, estimated with [EAZY]{} [@brammer08], is $z_{\rm phot}=7.42^{+0.20}_{-0.71}$, in good agreement with the spectrosopic redshift, as shown in the inset of Figure \[fig:sed\].

The line-of-sight velocity dispersion, derived from the Ly$\alpha$ line width on the red side of the line and corrected for instrumental resolution, is 180 $\pm$ 30 km s$^{-1}$, similar to previously spectroscopically confirmed galaxies at similar redshifts [@oesch15; @zitrin15]

We fit an asymmetric Gaussian to the line to estimate the line flux of (5.5 $\pm$ 0.9) $\times 10^{-18}$ erg s$^{-1}$ cm$^{-2}$. We estimated the rest-frame EW of Ly$\alpha$ emission from the observed Ly$\alpha$ flux and continuum flux density of the best-fit stellar population synthesis (SPS) model in a rest-frame 100 Å box redward of the Ly$\alpha$ line (see Section \[sec:sedfit\]). The inferred rest-frame EW of Ly$\alpha$ emission is modest with $15.6^{+5.9}_{-3.6}$ Å, 