Spectroscopic observation of Lyα emitters at z~7.7 and implications on re-ionization

We present spectroscopic follow-up observations on two bright Ly\alpha emitter (LAE) candidates originally found by Krug et al. (2012) at a redshift of z~7.7 using the Multi-Object Spectrometer for Infra-Red Exploration (MOSFIRE) at Keck. We rule out any line emission at the >5\sigma level for both objects, putting on solid... Show more