The FENIKS Survey: Stellar-Halo Mass Relationship of Central and Satellite Galaxies in UDS and COSMOS at 0.2 < z < 4.5

We present the observed Stellar-to-Halo mass relationship (SHMR) spanning 0.2 < z < 4.5 enabled through galaxy clustering and abundance measurements from two large (effective area about 1.61 deg squared) and homogeneously prepared photometric catalogs - UltraVISTA ultra-deep stripes DR3 (COSMOS) and FENIKS v2 (UDS). To translate these measurements into the SHMR, we introduce a novel halo occupation distribution (HOD) fitting approach (``smooth- z '') whereby HOD parameters between neighboring z-bins are disallowed sharp changes through continuity priors. As a result, the high constraining power at z 2, due to a much wider dynamical range in stellar mass (about 3 dex), helps constrain the SHMR at z 2, where that range shrinks down to 1 dex. We find a clear downsizing trend in halo mass scale with peak integrated star-forming efficiency (SFE), M h peak as it consistently decreases from 10 12.69+0.08-0.08 M at z about 4 to 10 12.17+0.03-0.03 M at z about 0.35, exhibiting a decline of 0.52 dex. Furthermore, we show that if we had relied on COSMOS data alone (as opposed to UDS+COSMOS), as has been done by many preceding studies, M h peak would be systematically lower by up to about 0.2 dex at z < 1.25, highlighting the importance of mitigating cosmic variance. Finally, for the first time, we show how the integrated SFE evolves with redshift as halos grow in mass along their progenitor merger trees, instead of at fixed halo masses.