  We test whether Lyman alpha emitters (LAEs) and Lyman-break galaxies (LBGs)
can be good tracers of high-z large-scale structures, using the Horizon Run 5
cosmological hydrodynamical simulation. We identify LAEs using the Ly{\alpha}
emission line luminosity and its equivalent width, and LBGs using the
broad-band magnitudes at z~2.4, 3.1, and 4.5. We first compare the spatial
distributions of LAEs, LBGs, all galaxies, and dark matter around the
filamentary structures defined by dark matter. The comparison shows that both
LAEs and LBGs are more concentrated toward the dark matter filaments than dark
matter. We also find an empirical fitting formula for the vertical density
profile of filaments as a binomial power-law relation of the distance to the
filaments. We then compare the spatial distributions of the samples around the
filaments defined by themselves. LAEs and LBGs are again more concentrated
toward their filaments than dark matter. We also find the overall consistency
between filamentary structures defined by LAEs, LBGs, and dark matter, with the
median spatial offsets that are smaller than the mean separation of the sample.
These results support the idea that the LAEs and LBGs could be good tracers of
large-scale structures of dark matter at high redshifts.
