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- Title
GOLDRUSH. II. Clustering of galaxies at z ~ 4-6 revealed with the half-million dropouts over the 100 deg<sup>2</sup> area corresponding to 1 Gpc<sup>3</sup>.
- Authors
Yuichi HARIKANE; Masami OUCHI; Yoshiaki ONO; Shun SAITO; Peter BEHROOZI; Surhud MORE; Kazuhiro SHIMASAKU; Jun TOSHIKAWA; Yen-Ting LIN; Masayuki AKIYAMA; Jean COUPON; Yutaka KOMIYAMA; Akira KONNO; Sheng-Chieh LIN; Satoshi MIYAZAKI; NISHIZAWA, Atsushi J.; Takatoshi SHIBUYA; John SILVERMAN
- Abstract
We present clustering properties from 579492 Lyman-break galaxies (LBGs) at z ~ 4-6 over the 100 deg2 sky (corresponding to a 1.4 Gpc3 volume) identified in early data of the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. We derive angular correlation functions (ACFs) for the HSC LBGs with unprecedentedly high statistical accuracies at z ~ 4-6, and compare them with the halo occupation distribution (HOD) models. We clearly identify significant ACF excesses in 10" < θ < 90", the transition scale between one- and two-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 ~ 4-7, we investigate the dark matter halo mass (Mh) of the z ~ 4-7 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 accretion rate (M˙h) over a wide mass range of Mh/M⊙ = 4 × 1010-4 × 1012. We find that the SHMR increases from z ~ 4 to 7 by a factor of ~4 at Mh ≃ 1 × 1011M⊙ , while the SHMR shows no strong evolution in the similar redshift range at Mh ≃ 1 × 1012M⊙ . Interestingly, we identify a tight relation of SFR/M˙h-Mh showing no significant evolution beyond 0.15 dex in this wide mass range over z ~ 4-7. This weak evolution suggests that the SFR/M˙h-Mh relation is a fundamental relation in high-redshift galaxy formation whose star formation activities are regulated by the dark matter mass assembly. Assuming this fundamental relation, we calculate the cosmic star formation rate densities (SFRDs) over z = 0-10 (a.k.a. the Madau-Lilly plot). The cosmic SFRD evolution based on the fundamental relation agrees with the one obtained by observations, suggesting that the cosmic SFRD increase from z ~ 10 to 4 - 2 (decrease from z ~ 4-2 to 0) is mainly driven by the increase of the halo abundance (the decrease of the accretion rate).
- Subjects
GALAXY clusters; IMAGING systems in astronomy; GALACTIC halos; DARK matter; STAR formation; GALACTIC redshift; GALACTIC evolution; GALAXY formation
- Publication
Publications of the Astronomical Society of Japan, 2018, Vol 70, Issue Supp1, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psx097