2007ApJ...671..278G

We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample of 162 Lyα-emitting (LAE) galaxies at z≃3.1 discovered in deep narrowband MUSYC imaging of the Extended Chandra Deep Field-South. LAEs were selected to have observed frame equivalent widths >80 Å and emission line fluxes >1.5x10^–17 ergs/cm2/s. Only 1% of our LAE sample appears to host AGNs. The LAEs exhibit a moderate spatial correlation length of r₀=3.6^+0.8_–1.0Mpc, corresponding to a bias factor b=1.7^+0.3_–0.4, which implies median dark matter halo masses of log₁₀M_med=10.9^+0.5_–0.9 M_☉. Comparing the number density of LAEs, 1.5±0.3x10^–3/Mpc3, with the number density of these halos finds a mean halo occupation ∼1%-10%. The evolution of galaxy bias with redshift implies that most z=3.1 LAEs evolve into present-day galaxies with L<2.5L^*, whereas other z>3 galaxy populations typically evolve into more massive galaxies. Halo merger trees show that z=0 descendants occupy halos with a wide range of masses, with a median descendant mass close to that of L^*. Only 30% of LAEs have sufficient stellar mass (≳3x10⁹ M_☉) to yield detections in deep Spitzer IRAC imaging. A two-population SED fit to the stacked UBVRIzJK+[3.6, 4.5, 5.6, 8.0] µm fluxes of the IRAC-undetected objects finds that the typical LAE has low stellar mass (1.0^+0.6_–0.4x10⁹ M_☉), moderate star formation rate (2±1 M_☉/yr), a young component age of 20⁺³⁰_–10Myr, and little dust (A_V<0.2). The best-fit model has 20% of the mass in the young stellar component, but models without evolved stars are also allowed.