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Ly$\alpha$ emission from galaxies can be utilized to characterize theionization state in the intergalactic medium (IGM). We report our search forLy$\alpha$ emission at $z>7$ using a comprehensive Keck/MOSFIRE near-infraredspectroscopic dataset, as part of the Texas Spectroscopic Search for Ly$\alpha$Emission at the End of Reionization Survey. We analyze data from 10 nights ofMOSFIRE observations which together target 72 high-$z$ candidate galaxies inthe GOODS-N field, all with deep exposure times of 4.5-19 hr. Utilizing animproved automated emission-line search, we report 10 Ly$\alpha$ emission linesdetected ($>$4$\sigma$) at $z>7$, significantly increasing thespectroscopically confirmed sample. Our sample includes large equivalent-width(EW) Ly$\alpha$ emitters ($>$50\r{A}), and additional tentative Ly$\alpha$emission lines detected at 3 - 4$\sigma$ from five additional galaxies. Weconstrain the Ly$\alpha$ EW distribution at $z\sim7.6$, finding a significantdrop from $z\lesssim6$, suggesting an increasing fraction of neutral hydrogen(HI) in the IGM in this epoch. We estimate the Ly$\alpha$ transmission throughthe IGM ($=$EW$_{z\sim\text{7.6}}$/EW$_{z\sim\text{2-6}}$), and infer an IGM HIfraction ($X_{\text{HI}}$) of $49^{+19}_{-19}\%$ at $z\sim7.6$, which is lowerin modest tension ($>$1$\sigma$) with recent measurements at $z \sim$ 7.6. Thespatial distribution of the detected Ly$\alpha$ emitters implies the presenceof a potential highly ionized region at $z\sim7.55$ which hosts four Ly$\alpha$emitters within a $\sim$ 40 cMpc spatial separation. The prominence of thisionized region in our dataset could explain our lower inferred value of$X_{\text{HI}}$, though our analysis is also sensitive to the chosen referenceLy$\alpha$ EW distribution values and reionization models.

astrophysical journal/the astrophysical journal

Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of  Reionization III. the Ly$\alpha$ Equivalent-width Distribution and Ionized  Structures at $z > 7$