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

Author

Yuichi Harikane
Masami Ouchi
Yoshiaki Ono
Surhud More
Shun Saito, Missouri University of Science and TechnologyFollow
For full list of authors, see publisher's website.

Abstract

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 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 ) x 10¹¹ M_⊙. Our M_h estimates agree with those obtained by previous clustering studies in a UV-magnitude versus 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 from 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 at the dark matter halo mass of M_h ~ 10¹¹ M_⊙. We compare our SHMRs with results of a hydrodynamic simulation and a semianalytic model and find that these theoretical studies do not predict the SHMR increase from 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.

Recommended Citation

Y. Harikane et al., "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," Astrophysical Journal, vol. 821, no. 2, Institute of Physics - IOP Publishing, Apr 2016.

The definitive version is available at https://doi.org/10.3847/0004-637X/821/2/123

Department(s)

Physics

Keywords and Phrases

Galaxies: Evolution; Galaxies: Formation; Galaxies: High-redshift

International Standard Serial Number (ISSN)

0004-637X; 1538-4357

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2016 The American Astronomical Society, All rights reserved.

Publication Date

01 Apr 2016