Correlation between Outlying Halo Abundance and Host Halo Properties

Abstract

The correlations between dark matter halo properties and subhalo abundance, or occupation, have been studied extensively; however, existing studies have mainly focused on subhalos within the virial radius of the host halo. In this work, we quantify the correlation between host halo properties and the abundance of neighboring halos that reside right outside of the virial radius of the host halos. We compute the correlations between four host halo properties (half-mass scale, concentration, peak-mass scale, and spin) and the outlying halo occupation out to 1.5 Mpc for Milky Way-mass host halos, and study how the correlation strength varies with radius. We also investigate if the outlying halo occupation can provide information about the host halo properties. We find that host halo properties impact the neighboring halo abundance beyond the virial radius, and the locations at which the correlation peaks do not typically align with the virial radius or splashback radius. The behavior of this observed correlation as a function of radius, especially in the outskirts, is connected to the effect of halo assembly bias. However, there is no universal behavior when considering different host halo properties. Our results are the first to quantify the occupation variation of outlying halos beyond the virial radius. They provide the theoretical background for interpreting the observed satellite systems when the observed satellites are not strictly defined to be within the virial radius.

15 pages, 7 figures. Accepted for publication in Publications of the Astronomical Society of the Pacific (PASP). Manuscript title was updated during revision process

References in corpus (50)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• The Structure of Cold Dark Matter Halos
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• The Dark Side of the Halo Occupation Distribution
• Theoretical Models of the Halo Occupation Distribution: Separating Central and Satellite Galaxies
• The Luminosity and Color Dependence of the Galaxy Correlation Function
• The Connection between Galaxies and their Dark Matter Halos
• The age dependence of halo clustering
• Halo concentrations in the standard LCDM cosmology
• Gravitationally Consistent Halo Catalogs and Merger Trees for Precision Cosmology
• The Dependence of Halo Clustering on Halo Formation History, Concentration, and Occupation
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• Dark matter and cosmic structure
• The effect of primordial non-Gaussianity on halo bias
• The Connection between Galaxies and Dark Matter Structures in the Local Universe
• The Physics of Galaxy Clustering I: A Model for Subhalo Populations
• Milky Way Satellite Census. III. Constraints on Dark Matter Properties from Observations of Milky Way Satellite Galaxies
• The splashback radius as a physical halo boundary and the growth of halo mass
• The SAGA Survey: I. Satellite Galaxy Populations Around Eight Milky Way Analogs
• The Excursion Set Theory of Halo Mass Functions, Halo Clustering, and Halo Growth
• Cosmological Constraints from a Combination of Galaxy Clustering and Lensing -- I. Theoretical Framework
• Galaxy Assembly Bias: A Significant Source of Systematic Error in the Galaxy-Halo Relationship
• The SAGA Survey. II. Building a Statistical Sample of Satellite Systems around Milky Way-like Galaxies
• The MultiDark Database: Release of the Bolshoi and MultiDark Cosmological Simulations
• Introducing Decorated HODs: modeling assembly bias in the galaxy-halo connection
• On Halo Formation Times and Assembly Bias
• Subhalo abundance matching and assembly bias in the EAGLE simulation
• Gaia early DR3 systemic motions of Local Group dwarf galaxies and orbital properties with a massive Large Magellanic Cloud
• The Concentration Dependence of the Galaxy-Halo Connection: Modeling Assembly Bias with Abundance Matching
• The mass of our Milky Way
• Mergers and Mass Accretion for Infalling Halos Both End Well Outside Cluster Virial Radii
• The splashback radius of halos from particle dynamics. II. Dependence on mass, accretion rate, redshift, and cosmology
• The Dependence of Subhalo Abundance on Halo Concentration
• Wide-Field Survey of Dwarf Satellite Systems Around 10 Hosts in the Local Volume
• The Three Causes of Low-Mass Assembly Bias
• The SAGA Survey. III. A Census of 101 Satellite Systems around Milky Way-mass Galaxies
• Flybys, orbits, splashback: subhalos and the importance of the halo boundary
• The Immitigable Nature of Assembly Bias: The Impact of Halo Definition on Assembly Bias
• Galaxy groups in the 2MASS Redshift Survey
• Evidence of Galaxy Assembly Bias in SDSS DR7 Galaxy Samples from Count Statistics
• Distance and mass of the M104 (Sombrero) group
• Dwarf Galaxies in the MATLAS Survey: The satellite system of NGC474 under scrutiny with MUSE
• DES to HSC: Detecting low surface brightness galaxies in the Abell 194 cluster using transfer learning
• Improving Galaxy Cluster Selection with the Outskirt Stellar Mass of Galaxies