Construct the emission line galaxy-host halo connection through auto and
  cross correlations
  We investigate the [O\,II] emission line galaxy (ELG)-host halo connection
via auto and cross correlations, and propose a concise and effective method to
populate ELGs in dark matter halos without assuming a parameterized halo
occupation distribution (HOD) model. Using the observational data from VIMOS
Public Extragalactic Redshift Survey (VIPERS), we measure the auto and cross
correlation functions between ELGs selected by [O\,II] luminosity and normal
galaxies selected by stellar mass. Combining the stellar-halo mass relation
(SHMR) derived for the normal galaxies and the fraction of ELGs observed in the
normal galaxy population, we demonstrate that we can establish an accurate
ELG-halo connection. With the ELG-halo connection, we can accurately reproduce
the auto and cross correlation functions of ELGs and normal galaxies both in
real-space and in redshift-space, once the satellite fraction is properly
reduced. Our method provides a novel strategy to generate ELG mock catalogs for
ongoing and upcoming galaxy redshift surveys. We also provide a simple
description for the HOD of ELGs.
