Аннотация
We present clustering properties from 579,492 Lyman break galaxies (LBGs) at
$z\sim4-6$ over the 100 deg$^2$ sky (corresponding to a 1.4 Gpc$^3$ volume)
identified in early data of the Hyper Suprime-Cam (HSC) Subaru strategic
program survey. We derive angular correlation functions (ACFs) of the HSC LBGs
with unprecedentedly high statistical accuracies at $z\sim4-6$, and compare
them with the halo occupation distribution (HOD) models. We clearly identify
significant ACF excesses in $10"<þeta<90"$, the transition scale between 1-
and 2-halo terms, suggestive of the existence of the non-linear halo bias
effect. Combining the HOD models and previous clustering measurements of faint
LBGs at $z\sim4-7$, we investigate dark-matter halo mass ($M_h$) of
the $z\sim4-7$ LBGs and its correlation with various physical properties
including the star-formation rate (SFR), the stellar-to-halo mass ratio (SHMR),
and the dark-matter mass accretion rate ($M_h$) over a wide-mass
range of $M_h/M_ødot=4\times10^10-4\times10^12$. We find that the
SHMR increases from $z\sim4$ to $7$ by a factor of $\sim4$ at
$M_h\simeq1\times10^11\ M_ødot$, while the SHMR shows no strong
evolution in the similar redshift range at $M_h\simeq1\times10^12\
M_ødot$. Interestingly, we identify a tight relation of
$SFR/M_h-M_h$ showing no significant evolution beyond
0.15 dex in this wide-mass range over $z\sim4-7$. This weak evolution suggests
that the $SFR/M_h-M_h$ relation is a fundamental
relation in high-redshift galaxy formation whose star-formation activities are
regulated by the dark-matter mass assembly.
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