Takuya HASHIMOTO
(The University of Tokyo)
We present the results of Magellan/MMIRS and Keck/NIRSPEC spectroscopy for five Lya emitters (LAEs) at z=2.2 for which high-resolution FUV spectra from Magellan/MagE are available. We detect nebular emission lines including Ha on the individual basis and low-ionization interstellar (LIS) absorption lines in a stacked FUV spectrum, and measure average offset velocities of the Lya line, Delta_v_Lya, and LIS absorption lines, Delta_v_abs, with respect to the systemic velocity defined by the nebular lines. <br>From the fact that LAEs have Delta_v_abs ~ Delta_v_Lya, while LBGs have Delta_v_abs ~ 2 Delta_v_Lya, we point out that low neutral hydrogen column density in LAEs is crucial for Lya transfer in LAEs.