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Testing Lyα Emitters and Lyman-break Galaxies as Tracers of Large-scale Structures at High Redshifts

Authors :
Sang Hyeok Im
Ho Seong Hwang
Jaehong Park
Jaehyun Lee
Hyunmi Song
Stephen Appleby
Yohan Dubois
C. Gareth Few
Brad K. Gibson
Juhan Kim
Yonghwi Kim
Changbom Park
Christophe Pichon
Jihye Shin
Owain N. Snaith
M. Celeste Artale
Eric Gawiser
Lucia Guaita
Woong-Seob Jeong
Kyoung-Soo Lee
Nelson Padilla
Vandana Ramakrishnan
Paulina Troncoso
Yujin Yang
Source :
The Astrophysical Journal, Vol 972, Iss 2, p 196 (2024)
Publication Year :
2024
Publisher :
IOP Publishing, 2024.

Abstract

We test whether Lyα emitters (LAEs) and Lyman-break galaxies (LBGs) can be good tracers of high- z large-scale structures, using the Horizon Run 5 cosmological hydrodynamical simulation. We identify LAEs using the Ly α emission line luminosity and its equivalent width, and LBGs using the broadband magnitudes at z ∼ 2.4, 3.1, and 4.5. We first compare the spatial distributions of LAEs, LBGs, all galaxies, and dark matter around the filamentary structures defined by dark matter. The comparison shows that both LAEs and LBGs are more concentrated toward the dark matter filaments than dark matter. We also find an empirical fitting formula for the vertical density profile of filaments as a binomial power-law relation of the distance to the filaments. We then compare the spatial distributions of the samples around the filaments defined by themselves. LAEs and LBGs are again more concentrated toward their filaments than dark matter. We also find the overall consistency between filamentary structures defined by LAEs, LBGs, and dark matter, with the median spatial offsets that are smaller than the mean separation of the sample. These results support the idea that the LAEs and LBGs could be good tracers of large-scale structures of dark matter at high redshifts.

Details

Language :
English
ISSN :
15384357
Volume :
972
Issue :
2
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
edsdoj.36fbd60182d247e4b1e3e1ddf79fe20a
Document Type :
article
Full Text :
https://doi.org/10.3847/1538-4357/ad67d2