skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment

Abstract

In this paper we use high-resolution cosmological simulations to study halo intrinsic alignment and its dependence on mass, formation time, and large-scale environment. In agreement with previous studies using N -body simulations, it is found that massive halos have stronger alignment. For the first time, we find that for a given halo mass older halos have stronger alignment and halos in cluster regions also have stronger alignment than those in filaments. To model these dependencies, we extend the linear alignment model with inclusion of halo bias and find that the halo alignment with its mass and formation time dependence can be explained by halo bias. However, the model cannot account for the environment dependence, as it is found that halo bias is lower in clusters and higher in filaments. Our results suggest that halo bias and environment are independent factors in determining halo alignment. We also study the halo alignment correlation function and find that halos are strongly clustered along their major axes and less clustered along the minor axes. The correlated halo alignment can extend to scales as large as 100 h {sup −1} Mpc, where its feature is mainly driven by the baryon acoustic oscillation effect.

Authors:
; ; ;  [1]; ;  [2];  [3];  [4]
  1. Purple Mountain Observatory, the Partner Group of MPI für Astronomie, 2 West Beijing Road, Nanjing 210008 (China)
  2. Center for Astronomy and Astrophysics, Shanghai Jiao Tong University, Shanghai 200240 (China)
  3. Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026 (China)
  4. Astronomy Department and Center for Astrophysics, Tsinghua University, Beijing 10084 (China)
Publication Date:
OSTI Identifier:
22679771
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 848; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALIGNMENT; BARYONS; CORRELATION FUNCTIONS; FILAMENTS; GALAXIES; INCLUSIONS; MASS; NONLUMINOUS MATTER; OSCILLATIONS; RESOLUTION; SIMULATION; TIME DEPENDENCE; UNIVERSE

Citation Formats

Xia, Qianli, Kang, Xi, Wang, Peng, Luo, Yu, Yang, Xiaohu, Jing, Yipeng, Wang, Huiyuan, and Mo, Houjun, E-mail: kangxi@pmo.ac.cn. Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8D17.
Xia, Qianli, Kang, Xi, Wang, Peng, Luo, Yu, Yang, Xiaohu, Jing, Yipeng, Wang, Huiyuan, & Mo, Houjun, E-mail: kangxi@pmo.ac.cn. Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment. United States. doi:10.3847/1538-4357/AA8D17.
Xia, Qianli, Kang, Xi, Wang, Peng, Luo, Yu, Yang, Xiaohu, Jing, Yipeng, Wang, Huiyuan, and Mo, Houjun, E-mail: kangxi@pmo.ac.cn. Tue . "Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment". United States. doi:10.3847/1538-4357/AA8D17.
@article{osti_22679771,
title = {Halo Intrinsic Alignment: Dependence on Mass, Formation Time, and Environment},
author = {Xia, Qianli and Kang, Xi and Wang, Peng and Luo, Yu and Yang, Xiaohu and Jing, Yipeng and Wang, Huiyuan and Mo, Houjun, E-mail: kangxi@pmo.ac.cn},
abstractNote = {In this paper we use high-resolution cosmological simulations to study halo intrinsic alignment and its dependence on mass, formation time, and large-scale environment. In agreement with previous studies using N -body simulations, it is found that massive halos have stronger alignment. For the first time, we find that for a given halo mass older halos have stronger alignment and halos in cluster regions also have stronger alignment than those in filaments. To model these dependencies, we extend the linear alignment model with inclusion of halo bias and find that the halo alignment with its mass and formation time dependence can be explained by halo bias. However, the model cannot account for the environment dependence, as it is found that halo bias is lower in clusters and higher in filaments. Our results suggest that halo bias and environment are independent factors in determining halo alignment. We also study the halo alignment correlation function and find that halos are strongly clustered along their major axes and less clustered along the minor axes. The correlated halo alignment can extend to scales as large as 100 h {sup −1} Mpc, where its feature is mainly driven by the baryon acoustic oscillation effect.},
doi = {10.3847/1538-4357/AA8D17},
journal = {Astrophysical Journal},
number = 1,
volume = 848,
place = {United States},
year = {Tue Oct 10 00:00:00 EDT 2017},
month = {Tue Oct 10 00:00:00 EDT 2017}
}