Don't Forget the Forest for the Trees: The Stellar-Mass Halo-Mass Relation in Different Environments

Abstract

The connection between dark matter halos and galactic baryons is often not well-constrained nor well-resolved in cosmological hydrodynamical simulations. Thus, Halo Occupation Distribution (HOD) models that assign galaxies to halos based on halo mass are frequently used to interpret clustering observations, even though it is well-known that the assembly history of dark matter halos is related to their clustering. In this paper we use high-resolution hydrodynamical cosmological simulations to compare the halo and stellar mass growth of galaxies in a large-scale overdensity to those in a large-scale underdensity (on scales of about 20 Mpc). The simulation reproduces assembly bias, that halos have earlier formation times in overdense environments than in underdense regions. We find that the stellar mass to halo mass ratio is larger in overdense regions in central galaxies residing in halos with masses between 10${}^{11}$-10${}^{12.9}$ M${}_{\odot }$. When we force the local density (within 2 Mpc) at z=0 to be the same for galaxies in the large-scale over- and underdensities, we find the same results. We posit that this difference can be explained by a combination of earlier formation times, more interactions at early times with neighbors, and more filaments feeding galaxies in overdense regions. This result puts the standard practice of assigning stellar mass to halos based only on their mass, rather than considering their larger environment, into question.

14 pages, 7 figures, accepted to ApJ

References in corpus (17)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• Assembly bias in the clustering of dark matter haloes
• Bimodal gas accretion in the Horizon-MareNostrum galaxy formation simulation
• Halo assembly bias and its effects on galaxy clustering
• Galaxy Assembly Bias: A Significant Source of Systematic Error in the Galaxy-Halo Relationship
• The Star Formation History of the Universe as Revealed by Deep Radio Observations
• Modelling galaxy clustering in a high resolution simulation of structure formation
• Environmental Dependence of Dark Matter Halo Growth I: Halo Merger Rates
• Environmentally-Driven Evolution of Simulated Cluster Galaxies
• The Dependence of the Mass Assembly History of Cold Dark Matter Halos on Environment
• Environmental Dependence of Cold Dark Matter Halo Formation
• The Clustering of Massive Halos
• Void Statistics in Large Galaxy Redshift Surveys: Does Halo Occupation of Field Galaxies Depend on Environment?
• Effects of large-scale environment on the assembly history of central galaxies
• Evolution of Cold Streams and Emergence of the Hubble Sequence
• On the Reversal of SFR-Density Relation at z=1: Insights from Simulations

Cited by in corpus (19)

• The Impact of Assembly Bias on the Galaxy Content of Dark Matter Halos
• The stellar-to-halo mass relation of GAMA galaxies from 100 square degrees of KiDS weak lensing data
• The distinct stellar-to-halo mass relations of satellite and central galaxies: insights from the IllustrisTNG simulations
• The effect of cosmic web filaments on the properties of groups and their central galaxies
• Properties of simulated galaxies and supermassive black holes in cosmic voids
• The RESOLVE Survey Atomic Gas Census and Environmental Influences on Galaxy Gas Reservoirs
• The VIMOS Public Extragalactic Redshift Survey (VIPERS). The decline of cosmic star formation: quenching, mass, and environment connections
• The Morphology-Density-Relation: Impact on the Satellite Fraction
• Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
• Revealing the cosmic web dependent halo bias
• Multi-frequency studies of galaxies and groups: I. Environmental effect on galaxy stellar mass and morphology
• Determining the Halo Mass Scale where Galaxies Lose Their Gas
• Local and large-scale effects on the astrophysics of void-galaxies
• Probing the Dependence of the Intergalactic Medium on Large Scale Environment Using the Low Redshift Lyman Alpha Forest
• Using galaxy pairs to investigate the three-point correlation function in the squeezed limit
• The influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies
• Influence of the Void Environment on Chemical Abundances in Dwarf Galaxies and Implications for Connecting Star Formation and Halo Mass
• Large-scale environmental dependence of the abundance ratio of nitrogen to oxygen in blue, star-forming galaxies fainter than L*
• Traces of the evolution of cosmic void galaxies: An Integral Field Spectroscopy based analysis