  Emission line galaxies (ELGs) are targeted by the new generation of
spectroscopic surveys to make unprecedented measurements in cosmology from
their distribution. Accurately interpreting this data requires understanding
the imprints imposed by the physics of galaxy formation and evolution on galaxy
clustering. In this work we utilize a semi-analytical model of galaxy formation
(SAGE) to explore the necessary components for accurately reproducing the
clustering of ELGs. We focus on developing a Halo Occupation Distribution (HOD)
prescription able to reproduce the clustering of SAGE galaxies. Typically, HOD
models assume that satellite and central galaxies of a given type are
independent events. We investigate the need for conformity, i.e. whether the
average satellite occupation depends on the existence of a central galaxy of a
given type. Incorporating conformity into HOD models is crucial for reproducing
the clustering in the reference galaxy sample. Another aspect we investigate is
the radial distribution of satellite galaxies within haloes. The traditional
density profile models, NFW and Einasto profiles, fail to accurately replicate
the small-scale clustering measured for SAGE satellite galaxies. To overcome
this limitation, we propose a generalization of the NFW profile, thereby
enhancing our understanding of galaxy clustering.
