The mass and redshift dependence of halo star clustering

Abstract

We adopt the two point correlation function (2PCF) as a statistical tool to quantify the spatial clustering of halo stars, for galaxy systems spanning a wide range in host halo virial mass ($11.25<{\log }_{10}{M}_{200c}/{\mathrm{M}}_{\odot }<15$) and redshifts ($0<z<1.5$) from the IllustrisTNG simulations. Consistent with a previous study \cite[][Paper I]{2024ApJ...961..223Z}, we identify clear correlations between the strength of the 2PCF signals and galaxy formation redshifts, but over a much wider mass range. We find that such correlations are slightly stronger at higher redshifts, and get weakened with the increase of host halo mass. We demonstrate that the spatial clustering of halo stars is affected by two factors: 1) the clustering gets gradually weakened as time passes (phase mixing); 2) newly accreted stars at more recent times would increase the clustering. For more massive galaxy systems, they assemble late and the newly accreted stars would increase the clustering. The late assembly of massive systems may also help to explain the weaker correlations between the 2PCF signals and the galaxy formation redshifts in massive halos, as their 2PCFs are affected more by recently accreted stars, while formation redshift characterizes mass accretion on a much longer timescale. We find that the orbits of satellite galaxies in more massive halos maintain larger radial anisotropy, reflecting the more active accretion state of their hosts while also contributing to their stronger mass loss rates.

arXiv commentaccepted by ApJ

References in corpus (82)

• Planck 2015 results. XIII. Cosmological parameters
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final dataset and cosmological implications
• Simulating Galaxy Formation with the IllustrisTNG Model
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• Co-formation of the Galactic disc and the stellar halo
• Halo occupation numbers and galaxy bias
• The Halo Occupation Distribution: Towards an Empirical Determination of the Relation Between Galaxies and Mass
• The Field of Streams: Sagittarius and its Siblings
• Theoretical Models of the Halo Occupation Distribution: Separating Central and Satellite Galaxies
• The Luminosity and Color Dependence of the Galaxy Correlation Function
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
• Debris streams in the solar neighbourhood as relicts from the formation of the Milky Way
• A giant stream of metal-rich stars in the halo of the galaxy M31
• The stellar mass assembly of galaxies in the Illustris simulation: growth by mergers and the spatial distribution of accreted stars
• Spatial correlation function and pairwise velocity dispersion of galaxies: CDM models versus the Las Campanas Survey
• A Low Latitude Halo Stream around the Milky Way
• Identification of A-colored Stars and Structure in the Halo of the Milky Way from SDSS Commissioning Data
• The Growth and Structure of Dark Matter Haloes
• Hierarchical galaxy formation and substructure in the Galaxy's stellar halo
• Galactoseismology: Discovery of Vertical Waves in the Galactic Disk
• Galactic Halo substructure in the Sloan Digital Sky Survey: the ancient tidal stream from the Sagittarius dwarf galaxy
• One Ring to Encompass them All: A giant stellar structure that surrounds the Galaxy
• Corrfunc --- A Suite of Blazing Fast Correlation Functions on the CPU
• The role of mergers and halo spin in shaping galaxy morphology
• Morphology and star formation in IllustrisTNG: the build-up of spheroids and discs
• Taking measure of the Andromeda halo: a kinematic analysis of the giant stream surrounding M31
• Quantifying Kinematic Substructure in the Milky Way's Stellar Halo
• More on the structure of tidal tails
• Detection of a 45 Degree Tidal Stream Associated with the Globular Cluster NGC 5466
• Dynamical Relics of the Ancient Galactic Halo
• The Andromeda galaxy's most important merger about 2 billion years ago as M32's likely progenitor
• The mass of our Milky Way
• The Overdensity in Virgo, Sagittarius Debris, and the Asymmetric Spheroid
• A Synoptic Map of Halo Substructures from the Pan-STARRS1 3π Survey
• Dynamical modeling of tidal streams
• Mapping the Galactic Halo VIII: Quantifying substructure
• The Eating Habits of Milky Way Mass Halos: Destroyed Dwarf Satellites and the Metallicity Distribution of Accreted Stars
• The real-space clustering of luminous red galaxies around z<0.6 quasars in the Sloan Digital Sky Survey
• The Cross-Correlation between Galaxies and Groups: Probing the Galaxy Distribution in and around Dark Matter Haloes
• The masses and metallicities of stellar haloes reflect galactic merger histories
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: modeling of the luminosity and colour dependence in the Data Release 10
• The mass of the Milky Way out to 100 kpc using halo stars
• The Circular Velocity Curve of the Milky Way from 5 to 25 kpc using luminous red giant branch star
• Mapping the Milky Way Disk with Gaia DR3: 3D extended kinematic maps and rotation curve to $\approx 30$ kpc
• StarGO: A New Method to Identify the Galactic Origins of Halo Stars
• The clustering of galaxies as a function of their photometrically-estimated atomic gas content
• The Aemulus Project V: Cosmological constraint from small-scale clustering of BOSS galaxies
• Peculiar Velocity Decomposition, Redshift Space Distortion and Velocity Reconstruction in Redshift Surveys. II. Dark Matter Velocity Statistics
• Multiplicity and clustering in Taurus star forming region. II. From ultra-wide pairs to dense NESTs
• The Two-Point Correlation of Galaxy Groups: Probing the Clustering of Dark Matter Haloes
• A natural boundary of dark matter haloes revealed around the minimum bias and maximum infall locations
• Multiplicity and clustering in Taurus star-forming region. I. Unexpected ultra-wide pairs of high-order multiplicity in Taurus
• Star Formation in Isolated Dwarf Galaxies Hosting Tidal Debris: Extending the Dwarf-Dwarf Merger Sequence
• Milky Way Mass with K Giants and BHB Stars Using LAMOST, SDSS/SEGUE, and Gaia: 3D Spherical Jeans Equation and Tracer Mass Estimator
• ERGO-ML I: Inferring the assembly histories of IllustrisTNG galaxies from integral observable properties via invertible neural networks
• Mass of the dynamically hot inner stellar halo predicts the ancient accreted stellar mass
• Corrfunc: Blazing fast correlation functions with AVX512F SIMD Intrinsics
• Galaxy clustering and projected density profiles as traced by satellites in photometric surveys: Methodology and luminosity dependence
• The Fornax3D project: discovery of ancient massive merger events in the Fornax cluster galaxies NGC 1380 and NGC 1427
• Two New Halo Debris Streams in the Sloan Digital Sky Survey
• Detection of a Nearby Halo Debris Stream in the WISE and 2MASS Surveys
• A Two-Point Correlation Function For Galactic Halo Stars
• Quantifying the Smoothness of the Stellar Halo: A Link to Accretion History
• Linear bias and halo occupation distribution of emission line galaxies from Nancy Grace Roman Space Telescope
• The oblateness of the Milky Way dark matter halo from the stellar streams of NGC 3201, M68, and Palomar 5
• Physical evolution of dark matter halo around the depletion boundary
• Which Milky Way masses are consistent with the slightly declining 5-25 kpc rotation curve?
• Orbital distribution of infalling satellite halos across cosmic time
• HST resolves stars in a tiny body falling on the dwarf galaxy DDO 68
• ERGO-ML: Towards a robust machine learning model for inferring the fraction of accreted stars in galaxies from integral-field spectroscopic maps
• A machine learning approach to infer the accreted stellar mass fractions of central galaxies in the TNG100 simulation
• Two Portions of Sagittarius Stream in the LAMOST Complete Spectroscopic Survey of Pointing Area at Southern Galactic Cap
• Searching Extra-tidal Features around the Globular Cluster Whiting 1
• A New Tidal Stream Discovered in Gaia DR3
• Using two point correlation functions to understand the assembly histories of Milky Way-like galaxies