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23 April 2024 |
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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 | | Yuichi Harikane
; Masami Ouchi
; Yoshiaki Ono
; Surhud More
; Shun Saito
; Yen-Ting Lin
; Jean Coupon
; Kazuhiro Shimasaku
; Takatoshi Shibuya
; Paul A. Price
; Lihwai Lin
; Bau-Ching Hsieh
; Masafumi Ishigaki
; Yutaka Komiyama
; John Silverman
; Tadafumi Takata
; Hiroko Tamazawa
; Jun Toshikawa
; | | Date: |
24 Nov 2015 | | Abstract: | We present clustering analysis results from 10,540 Lyman break galaxies
(LBGs) at z~4-7 that are identified in a combination of the Hubble legacy deep
imaging and the complimentary large-area Subaru/Hyper Suprime-Cam data taken
very recently. We measure 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 the estimates 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 the LBGs. By comparison with the z~0 SHMR given by SDSS, 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 ~3 from z~0 to 4, and
increase by a factor of ~5 from z~4 to 7. We obtain the baryon conversion
efficiency (BCE) of our LBGs at z~4, and find that the BCE increases with
increasing dark matter halo mass. We finally compare our clustering+HOD
estimates with the abundance matching results, 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 is better with
those of the sophisticated abundance matching techniques that include subhalos,
incompleteness, and/or star formation rate+stellar mass function evolution. | | Source: | arXiv, 1511.7873 | | Services: | Forum | Review | PDF | Favorites | |
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