MR. CHARLES JOSE

Lyman alpha emitters (LAEs) are galaxies identified by means of their Lyman-Alpha emission line. Narrow-band surveys at redshifts 3 < z < 7 are resulted in large observational samples of LAEs which has allowed the estimation of luminosity functions (LFs) and clustering. We have shown that the clustering of LAEs can be understood in the framework of halo model and physical models of galaxy formation. In particular, the model parameters constrained by the observed LFs can be used to predict large scale bias and angular correlation function of LAEs. These predictions are shown to reproduce the observations remarkably well. We find that average masses of dark matter halos hosting LAEs brighter than a given threshold narrow-band magnitude are smaller than that of Lyman Break Galaxies (LBGs) brighter than similar threshold continuum magnitude by a factor 10. This results in a smaller clustering strength of LAEs compared to LBGs. However, using the observed relationship between UV continuum and Lyman-Alpha luminosity of LAEs, we show that both LAEs and LBGs belong to the same parent galaxy population with narrow band techniques having greater efficiency in picking up galaxies with low UV luminosity.