Evidence for Low Extinction in Actively Star-forming Galaxies at z > 6.5

We present a search for the [C II] 158 μm fine structure line (a main cooling line of the interstellar medium) and the underlying far-infrared (FIR) continuum in three high-redshift (6.6 6 LAEs studied here is lower by a factor of a few than what has recently been found in some LAEs at lower redshift (2 6 LAE sample is consistent with recent rest-frame UV studies of z ~ 7 Lyman break galaxies