Evolution of Stellar-to-Halo Mass Ratio at z=0-7 Identified by
  Clustering Analysis with the Hubble Legacy Imaging and Early Subaru/Hyper
  Suprime-Cam Survey Data
  We present clustering analysis results from 10,381 Lyman break galaxies
(LBGs) at z~ 4-7, identified in the Hubble legacy deep imaging and new
complimentary large-area Subaru/Hyper Suprime-Cam data. We measure the angular
correlation functions (ACFs) of these LBGs at z~4, 5, 6, and 7, and fit these
measurements using halo occupation distribution (HOD) models that provide an
estimate of halo masses, M_h~(1-20)x10^11 Msun. Our M_h estimates agree with
those obtained by previous clustering studies in a UV-magnitude vs. M_h plane,
and allow us to calculate stellar-to-halo mass ratios (SHMRs) of LBGs. By
comparison with the z~0 SHMR, we identify evolution of the SHMR from z~0 to
z~4, and z~4 to z~7 at the >98% confidence levels. The SHMR decreases by a
factor of ~2 from z~0 to 4, and increases by a factor of ~4 from z~4 to 7. We
compare our SHMRs with results of a hydrodynamic simulation and a semi-analytic
model, and find that these theoretical studies do not predict the SHMR increase
from z~4 to 7. We obtain the baryon conversion efficiency (BCE) of LBGs at z~4,
and find that the BCE increases with increasing dark matter halo mass. Finally,
we compare our clustering+HOD estimates with results from abundance matching
techniques, and conclude that the M_h estimates of the clustering+HOD analyses
agree with those of the simple abundance matching within a factor of 3, and
that the agreement improves when using more sophisticated abundance matching
techniques that include subhalos, incompleteness, and/or evolution in the star
formation and stellar mass functions.
