# Extensions to models of the galaxy–halo connection

@article{Hadzhiyska2020ExtensionsTM,
title={Extensions to models of the galaxy–halo connection},
author={Boryana Hadzhiyska and Sownak Bose and Daniel J. Eisenstein and Lars Hernquist},
journal={arXiv: Cosmology and Nongalactic Astrophysics},
year={2020}
}
We explore two widely used empirical models for the galaxy-halo connection, subhalo abundance matching (SHAM) and the halo occupation distribution (HOD) and compare their predictions with the hydrodynamical simulation IllustrisTNG (TNG) for a range of statistics that quantify the galaxy distribution at $n_{\rm gal}\approx1.3\times10^{-3}\,[{\rm Mpc}/h]^{-3}$. We observe that in their most straightforward implementations, both models fail to reproduce the two-point clustering measured in TNG. We… Expand

#### Figures from this paper

The galaxy–halo connection of emission-line galaxies in IllustrisTNG
• Physics
• 2021
We employ the hydrodynamical simulation IllustrisTNG-300-1 to explore the halo occupation distribution (HOD) and environmental dependence of luminous star-forming emission-line galaxies (ELGs) at \$zExpand
Dissecting and modelling galaxy assembly bias
• Physics
• 2021
Understanding the galaxy-halo connection is fundamental for contemporary models of galaxy clustering. The extent to which the haloes' assembly history and environment impact galaxy clustering (a.k.a.Expand
Evidence for galaxy assembly bias in BOSS CMASS redshift-space galaxy correlation function
• Physics
• 2021
Building accurate and flexible galaxy-halo connection models is crucial in modeling galaxy clustering on non-linear scales. Recent studies have found that halo concentration by itself cannot captureExpand
A fully Lagrangian, non-parametric bias model for dark-matter halos
• Xiaohan Wu
• Physics
• 2021
We present a non-parametric Lagrangian biasing model and fit the ratio of the halo and mass densities at the field level using the mass-weighted halo field in the AbacusSummit simulations at z = 0.5.Expand
The effect of finite halo size on the clustering of neutral hydrogen
• Physics
• 2021
Post-reionisation 21cm intensity mapping experiments target the spectral line of neutral hydrogen (HI) resident in dark matter haloes. According to the halo model, these discrete haloes trace theExpand
Modeling assembly bias with machine learning and symbolic regression
• Physics
• 2020
Upcoming 21cm surveys will map the spatial distribution of cosmic neutral hydrogen (HI) over unprecedented volumes. Mock catalogues are needed to fully exploit the potential of these surveys.Expand
Responses of Halo Occupation Distributions: a new ingredient in the halo model & the impact on galaxy bias
• Physics
• 2020
Halo occupation distribution (HOD) models describe the number of galaxies that reside in different haloes, and are widely used in galaxy-halo connection studies using the halo model (HM). Here, weExpand

#### References

SHOWING 1-10 OF 101 REFERENCES
Revealing the galaxy–halo connection in IllustrisTNG
We use the IllustrisTNG (TNG) simulations to explore the galaxy–halo connection as inferred from state-of-the-art cosmological, magnetohydrodynamical simulations. With the high-mass resolution andExpand
Testing the accuracy of halo occupation distribution modelling using hydrodynamic simulations
• Physics
• 2019
Halo models provide a simple and computationally inexpensive way to investigate the connection between galaxies and their dark matter haloes. However, these models rely on the assumption that theExpand
Cosmic web anisotropy is the primary indicator of halo assembly bias
• Physics
• Monthly Notices of the Royal Astronomical Society
• 2019
The internal properties of dark matter haloes correlate with the large-scale halo clustering strength at fixed halo mass – an effect known as assembly bias – and are also strongly affected by theExpand
The effects of assembly bias on cosmological inference from galaxy-galaxy lensing and galaxy clusters
• Physics
• 2016
The combination of galaxy-galaxy lensing (GGL) and galaxy clustering is a promising route to measuring the amplitude of matter clustering and testing modified gravity theories of cosmic acceleration.Expand
The three causes of low-mass assembly bias
• Physics
• 2020
We present a detailed analysis of the physical processes that cause halo assembly bias -- the dependence of halo clustering on proxies of halo formation time. We focus on the origin of assembly biasExpand
The DESI Experiment, a whitepaper for Snowmass 2013
The Dark Energy Spectroscopic Instrument (DESI) is a massively multiplexed fiber-fed spectrograph that will make the next major advance in dark energy in the timeframe 2018-2022. On the MayallExpand
A flexible modelling of galaxy assembly bias
• Physics
• 2020
We use the {\sc Illustris TNG300} magneto-hydrodynamic simulation, the {\sc SAGE} semi-analytical model, and the subhalo abundance matching technique (SHAM) to examine the diversity in predictionsExpand
• 2020
• 2020
• 2020