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Galaxies at high redshifts provide a valuable tool to study cosmic dawn, andtherefore it is crucial to reliably identify these galaxies. Here, we presentan unambiguous and first simultaneous detection of both the Lyman-alphaemission and the Lyman break from a z = 7.512+/- 0.004 galaxy, observed in theFaint Infrared Grism Survey (FIGS). These spectra, taken with G102 grism onHubble Space Telescope (HST), show a significant emission line detection (6sigma) in multiple observational position angles (PA), with total integratedLy{\alpha} line flux of 1.06+/- 0.12 e10-17erg s-1cm-2. The line flux is nearlya factor of four higher than the previous MOSFIRE spectroscopic observations offaint Ly{\alpha} emission at {\lambda} = 1.0347{\mu}m, yielding z = 7.5078+/-0.0004. This is consistent with other recent observations implying thatground-based near-infrared spectroscopy underestimates total emission linefluxes, and if confirmed, can have strong implications for reionization studiesthat are based on ground-based Lyman-{\alpha} measurements. A 4-{\sigma}detection of the NV line in one PA also suggests a weak Active Galactic Nucleus(AGN), potentially making this source the highest-redshift AGN yet found. Thus,this observation from the Hubble Space Telescope clearly demonstrates thesensitivity of the FIGS survey, and the capability of grism spectroscopy tostudy the epoch of reionization.

First results from Faint Infrared Grism Survey (FIGS): first simultaneous detection of Lyman-alpha emission and Lyman break from a galaxy at z=7.51