Mapping stellar content to dark matter halos - III.Environmental dependence and conformity of galaxy colours

Abstract

Recent studies suggest that the quenching properties of galaxies are correlated over several mega-parsecs. The large-scale "galactic conformity" phenomenon around central galaxies has been regarded as a potential signature of "galaxy assembly bias" or "pre-heating", both of which interpret conformity as a result of direct environmental effects acting on galaxy formation. Building on the iHOD halo quenching framework developed in Zu & Mandelbaum (2015, 2016), we discover that our fiducial halo mass quenching model, without any galaxy assembly bias, can successfully explain the overall environmental dependence and the conformity of galaxy colours in SDSS, as measured by the mark correlation functions of galaxy colours and the red galaxy fractions around isolated primaries, respectively. Our fiducial iHOD halo quenching mock also correctly predicts the differences in the spatial clustering and galaxy-galaxy lensing signals between the more vs. less red galaxy subsamples, split by the red-sequence ridge-line at fixed stellar mass. Meanwhile, models that tie galaxy colours fully or partially to halo assembly bias have difficulties in matching all these observables simultaneously. Therefore, we demonstrate that the observed environmental dependence of galaxy colours can be naturally explained by the combination of 1) halo quenching and 2) the variation of halo mass function with environment --- an indirect environmental effect mediated by two separate physical processes.

19 pages, 10 figures, comments welcome

References in corpus (45)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• Ram pressure stripping the hot gaseous halos of galaxies in groups and clusters
• 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
• The Evolution of Dark Matter Halo Properties in Clusters, Filaments, Sheets and Voids
• Towards a Concordant Model of Halo Occupation Statistics
• Spin alignment of dark matter haloes in filaments and walls
• The Galaxy-Halo Connection Over The Last 13.3 Gyrs
• Dependence of Galaxy Quenching on Halo Mass and Distance from its Centre
• Lensing is Low: Cosmology, Galaxy Formation, or New Physics?
• The role of mergers and halo spin in shaping galaxy morphology
• The dependence of dark halo clustering on the formation epoch and the concentration parameter
• The spin and orientation of dark matter halos within cosmic filaments
• A Halo Model of Galaxy Colors and Clustering in the SDSS
• Galaxy And Mass Assembly: Deconstructing Bimodality - I. Red ones and blue ones
• Satellite abundances around bright isolated galaxies
• Hot gas in massive halos drives both mass quenching and environment quenching
• The Halo Boundary of Galaxy Clusters in the SDSS
• Quenching of Star Formation in SDSS Groups: Centrals, Satellites, and Galactic Conformity
• Spin alignments of spiral galaxies within the large-scale structure from SDSS DR7
• Assessing Colour-dependent Occupation Statistics Inferred from Galaxy Group Catalogues
• Mergers drive spin swings along the cosmic web
• Do Mergers Spin up Dark Matter Halos?
• Properties of Dark Matter Halos as a Function of Local Environment Density
• Halo Histories vs. Galaxy Properties at z=0 II: Large-Scale Galactic Conformity
• Environmental Effects on Real-Space and Redshift-Space Galaxy Clustering
• Galactic Satellite Systems: Radial Distribution and Environment Dependence of Galaxy Morphology
• On the evidence for large-scale galactic conformity in the local Universe
• The RESOLVE Survey Atomic Gas Census and Environmental Influences on Galaxy Gas Reservoirs
• The nature of assembly bias - II. Halo spin
• Satellite Quenching, Galaxy Inner Density and the Halo Environment
• Halo abundances within the cosmic web
• Color Dependence in the Spatial Distribution of Satellite Galaxies
• The Dependence of the Mass-Metallicity Relation on Large Scale Environment
• Mass segregation trends in SDSS galaxy groups
• Are Halo and Galaxy Formation Histories Correlated?
• Measures of galaxy environment -- II. Rank-ordered mark correlations
• DESCQA: An Automated Validation Framework for Synthetic Sky Catalogs
• On the equivalence between the effective cosmology and excursion set treatments of environment
• Galaxy And Mass Assembly (GAMA): The absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations
• Segregation effects in DEEP2 galaxy groups

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• First results from the IllustrisTNG simulations: the galaxy color bimodality
• The Connection between Galaxies and their Dark Matter Halos
• Quenching as a Contest between Galaxy Halos and their Central Black Holes
• Dissecting and Modelling Galaxy Assembly Bias
• Multi-tracer extension of the halo model: probing quenching and conformity in eBOSS
• A flexible modelling of galaxy assembly bias
• CosmicGrowth Simulations---Cosmological simulations for structure growth studies
• Cosmic web dependence of galaxy clustering and quenching in SDSS
• Elucidating Galaxy Assembly Bias in SDSS
• Probing Galaxy Assembly Bias in BOSS Galaxies Using Void Probabilities
• The Conditional Colour-Magnitude Distribution: I. A Comprehensive Model of the Colour-Magnitude-Halo Mass Distribution of Present-Day Galaxies
• Group quenching and galactic conformity at low redshift
• Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
• Small- and Large-Scale Galactic Conformity in SDSS DR7
• The cosmological dependence of halo and galaxy assembly bias
• Probing the galaxy-halo connection with total satellite luminosity
• Galactic conformity measured in semi-analytic models
• On the environmental influence of groups and clusters of galaxies beyond the virial radius: Galactic conformity at few Mpc scales
• Construct the emission line galaxy-host halo connection through auto and cross correlations
• A Bayesian Hierarchical Approach to Galaxy-Galaxy Lensing
• Mufasa:The strength and evolution of galaxy conformity in various tracers
• Dissect two-halo galactic conformity effect for central galaxies: The dependence of star formation activities on the large-scale environment
• HI gas content of SDSS galaxies revealed by ALFALFA: implications for the mass-metallicity relation and the environmental dependence of HI in the local Universe
• How the Galaxy-Halo Connection Depends on Large-Scale Environment
• The Large-scale Effect of Environment on Galactic Conformity
• Toward Accurate Modeling of Galaxy Clustering on Small Scales: Constraining the Galaxy-Halo Connection with Optimal Statistics
• Toward Accurate Modeling of Galaxy Clustering on Small Scales: Halo Model Extensions and Lingering Tension
• Constraints on galactic outflows from the metallicity-stellar mass-SFR relation of EAGLE simulation and SDSS galaxies
• Accurate Modeling of the Projected Galaxy Clustering in Photometric Surveys: I. Tests with Mock Catalogs
• Assembly bias evidence in close galaxy pairs
• The dark matter halo masses of elliptical galaxies as a function of observationally robust quantities
• Unraveling emission line galaxy conformity at z~1 with DESI early data
• ELG$\times$LRG distribution through dark matter halo dynamics
• The conformity of HI galaxies in ALFALFA-SDSS sample
• Assessing the connection between galactic conformity and assembly-type bias
• On the dependence of galaxy assembly bias on the selection criteria, number density, and redshift of galaxy samples
• Strong Conformity and Assembly Bias: Towards a Physical Understanding of the Galaxy-Halo Connection in SDSS Clusters