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We spectroscopically confirmed two narrow-band selected redshift 7.0Ly$\alpha$ galaxies and studied their restframe UV spectra. The Ly$\alpha$ andother UV nebular lines are very useful to confirm the galactic redshifts anddiagnose the different mechanisms driving the ionizing emission. We observedtwo narrowband-selected $z$=7.0 Ly$\alpha$ candidates in the LAGER Chandra DeepField South (CDFS) field with IMACS at Magellan telescope and confirmed theyare Ly$\alpha$ emitters at $z$=6.924 and 6.931. In one galaxy, we also obtaineddeep NIR spectroscopy, which yields non-detections of the high-ionization UVnebular lines. We measured upper-limits of the ratios ofCIV$\lambda$1548/Ly$\alpha$, HeII$\lambda$1640/Ly$\alpha$,OIII]$\lambda$1660/Ly$\alpha$, and CIII]$\lambda$1909/Ly$\alpha$ from the NIRspectra. These upper-limits imply that the ionizing emission in this galaxy isdominated by normal star formation instead of AGN.

Lyman Alpha Galaxies in the Epoch of Reionization (LAGER): Spectroscopic Confirmation of Two Redshift ~ 7.0 Galaxies