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The distribution of Ly$\alpha$ emission is an presently accessible method forstudying the state of the intergalactic medium (IGM) into the reionization era.We carried out deep spectroscopic observations in order to search forLy$\alpha$ emission from galaxies with photometric redshifts $z$ = 5.5 - 8.3selected from the Cosmic Assembly Near-infrared Deep Extragalactic LegacySurvey (CANDELS). Utilizing data from the Keck/DEIMOS spectrograph, we explorea wavelength coverage of Ly$\alpha$ emission at $z$ ~ 5 - 7 with four nights ofspectroscopic observations for 118 galaxies, detecting five emission lines with~ 5$\sigma$ significance: three in the GOODS-N and two in the GOODS-S field. Weconstrain the equivalent width (EW) distribution of Ly$\alpha$ emission bycomparing the number of detected objects with the expected number constructedfrom detailed simulations of mock emission lines that account for theobservational conditions (e.g., exposure time, wavelength coverage, and skyemission) and galaxy photometric redshift probability distribution functions.The Ly$\alpha$ EW distribution is well described by an exponential form,$\text{dN/dEW}\propto \text{exp(-EW/}W_0)$, characterized by the $e$-foldingscale ($W_0$) of ~ 60 - 100$\AA$ at 0.3 < $z$ < 6. By contrast, our measure ofthe Ly$\alpha$ EW distribution at 6.0 < $z$ < 7.0 rejects a Ly$\alpha$ EWdistribution with $W_0$ > 36.4$\AA$ (125.3$\AA$) at 1$\sigma$ (2$\sigma$)significance. This provides additional evidence that the EW distribution ofLy$\alpha$ declines at $z$ > 6, suggesting an increasing fraction of neutralhydrogen in the IGM at that epoch.

astrophysical journal/the astrophysical journal

Texas Spectroscopic Search for Ly$\alpha$ Emission at the End of  Reionization I. Constraining the Ly$\alpha$ Equivalent Width Distribution at  6.0 < $z$ < 7.0