Correlations between triaxial shapes and formation history of dark matter haloes
Abstract
ABSTRACT The shape of dark matter (DM) haloes plays a critical role in constraining cosmology with upcoming large-scale structure surveys. In this paper, we study the correlations between the triaxial shapes and formation histories in DM haloes in the MultiDark Planck 2 N-body cosmological simulation. We find that halo ellipticity is strongly correlated with halo properties that serve as proxies of halo formation history, such as halo concentration and the normalized peak-centroid offset. These correlations are nearly independent of the halo density peak height. We present a simple model for the correlation between halo ellipticity and concentration using conditional abundance matching, and provide fitting formulae for the multidimensional distributions of triaxial halo shape as a function of halo peak height. We apply our halo shape model to gauge the effects of halo ellipticity and orientation bias on the excess surface mass density profiles in cluster-sized haloes. Our model should be useful for exploring the impact of triaxial halo shape on cosmological constraints in upcoming weak lensing surveys of galaxy clusters.
- Authors:
-
[1];
[3];
- Department of Physics, University of Miami, Coral Gables, FL 33124, USA
- Argonne National Lab, Lemont, IL 60439, USA
- Department of Physics, Yale University, New Haven, CT 06520, USA, Department of Astronomy, Yale University, New Haven, CT 06520, USA
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
- OSTI Identifier:
- 1734398
- Alternate Identifier(s):
- OSTI ID: 1812215
- Grant/Contract Number:
- AC02-06CH11357; AST-1412768
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 500 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; large-scale structure of Universe; cosmology; dark matter; galaxies: clusters: general; galaxies: groups: general; methods: numerical; theory
Citation Formats
Lau, Erwin T., Hearin, Andrew P., Nagai, Daisuke, and Cappelluti, Nico. Correlations between triaxial shapes and formation history of dark matter haloes. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa3313.
Lau, Erwin T., Hearin, Andrew P., Nagai, Daisuke, & Cappelluti, Nico. Correlations between triaxial shapes and formation history of dark matter haloes. United Kingdom. https://doi.org/10.1093/mnras/staa3313
Lau, Erwin T., Hearin, Andrew P., Nagai, Daisuke, and Cappelluti, Nico. Tue .
"Correlations between triaxial shapes and formation history of dark matter haloes". United Kingdom. https://doi.org/10.1093/mnras/staa3313.
@article{osti_1734398,
title = {Correlations between triaxial shapes and formation history of dark matter haloes},
author = {Lau, Erwin T. and Hearin, Andrew P. and Nagai, Daisuke and Cappelluti, Nico},
abstractNote = {ABSTRACT The shape of dark matter (DM) haloes plays a critical role in constraining cosmology with upcoming large-scale structure surveys. In this paper, we study the correlations between the triaxial shapes and formation histories in DM haloes in the MultiDark Planck 2 N-body cosmological simulation. We find that halo ellipticity is strongly correlated with halo properties that serve as proxies of halo formation history, such as halo concentration and the normalized peak-centroid offset. These correlations are nearly independent of the halo density peak height. We present a simple model for the correlation between halo ellipticity and concentration using conditional abundance matching, and provide fitting formulae for the multidimensional distributions of triaxial halo shape as a function of halo peak height. We apply our halo shape model to gauge the effects of halo ellipticity and orientation bias on the excess surface mass density profiles in cluster-sized haloes. Our model should be useful for exploring the impact of triaxial halo shape on cosmological constraints in upcoming weak lensing surveys of galaxy clusters.},
doi = {10.1093/mnras/staa3313},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 500,
place = {United Kingdom},
year = {Tue Aug 11 00:00:00 EDT 2020},
month = {Tue Aug 11 00:00:00 EDT 2020}
}
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