期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 70, 期 -, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psx097
关键词
galaxies: evolution; galaxies: formation; galaxies: high-redshift
资金
- FIRST program from the Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- KAKENHI through the Japan Society for the Promotion of Science (JSPS) [15H02064]
- Hayakawa Satio Fund - Astronomical Society of Japan
- Advanced Leading Graduate Course for Photon Science (ALPS) grant
- JSPS
- Grants-in-Aid for Scientific Research [16J07046, 15K17602, 16J03329, 15K21733] Funding Source: KAKEN
We present clustering properties from 579492 Lyman-break galaxies (LBGs) at z similar to 4-6 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) for the HSC LBGs with unprecedentedly high statistical accuracies at z similar to 4-6, and compare them with the halo occupation distribution (HOD) models. We clearly identify significant ACF excesses in 10 '' < theta < 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 similar to 4-7, we investigate the dark matter halo mass (M-h) of the z similar to 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)over dot>(h)) over a wide mass range of M-h/M-circle dot = 4 x 10(10)-4 x 10(12). We find that the SHMR increases from z similar to 4 to 7 by a factor of similar to 4 at Mh similar or equal to 1 x 10(11) M-circle dot, while the SHMR shows no strong evolution in the similar redshift range at M-h similar or equal to 1 x 10(12) M-circle dot. Interestingly, we identify a tight relation of SFR/<(M)over dot>(h)-M-h showing no significant evolution beyond 0.15 dex in this wide mass range over z similar to 4-7. This weak evolution suggests that the SFR/<(M)over dot>(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. 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 similar to 10 to 4 - 2 (decrease from z similar to 4-2 to 0) is mainly driven by the increase of the halo abundance (the decrease of the accretion rate).
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