A Pilot Survey for CIII] Emission in the Reionization Era: Gravitationally-Lensed z$\sim 7-8$ Galaxies in the Frontier Fields Cluster Abell 2744

Adi Zitrin, Richard S. Ellis, Sirio Belli +1

We report results of a search for CIII] $\lambda \lambda$1907,1909 Å emission using Keck's MOSFIRE spectrograph in a sample of 7 $z_{phot}\sim 7-8$ candidates ($H\sim 27$) lensed by the Hubble Fr…