BoRG CoI Tommaso Treu led a spectroscopic follow-up of 13 BoRG z~8 galaxies to search for Ly-$$\alpha$$ emission. The results have been published in the Astrophysical Journal.

The lack of Ly-$$\alpha$$ detection to a faint flux (median sensitivity of 25$$\mathring{A}$$ at 5$$\sigma$$) sets very interesting constraints on the evolution of the Ly-$$\alpha$$ equivalent width distribution, which is most naturally interpreted as evidence of an increase in the neutral gas content at z>6: