DarkMix: Mixture Models for the Detection and Characterization of Dark Matter Halos

Abstract

Dark matter simulations require statistical techniques to properly identify and classify their halos and structures. Nonparametric solutions provide catalogs of these structures but lack the additional learning of a model-based algorithm and might misclassify particles in merging situations. With mixture models, we can simultaneously fit multiple density profiles to the halos that are found in a dark matter simulation. In this work, we use the Einasto profile (Einasto 1965, 1968, 1969) to model the halos found in a sample of the Bolshoi simulation (Klypin et al. 2011), and we obtain their location, size, shape and mass. Our code is implemented in the R statistical software environment and can be accessed on https://github.com/LluisHGil/darkmix.

arXiv comment25 pages, 22 figures, 5 tables

References in corpus (26)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Halo Models of Large Scale Structure
• Mass function of dark matter halos
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Cold collapse and the core catastrophe
• Semi-Analytic Modelling of Galaxy Formation: The Local Universe
• Clustering of Galaxies in a Hierarchical Universe: I. Methods and Results at z=0
• Halos and galaxies in the standard cosmological model: results from the Bolshoi simulation
• Galaxy Clustering in the Completed SDSS Redshift Survey: The Dependence on Color and Luminosity
• Halo concentrations in the standard LCDM cosmology
• Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and Comparison with Parametric Models
• PolyChord: nested sampling for cosmology
• PolyChord: next-generation nested sampling
• Kinematics in Young Star Clusters and Associations with Gaia DR2
• The 2dF Galaxy Redshift Survey: galaxy clustering per spectral type
• The MultiDark Database: Release of the Bolshoi and MultiDark Cosmological Simulations
• The Spatial Structure of Young Stellar Clusters. I. Subclusters
• Clustering of Galaxy Clusters in CDM Universes
• The evolution of the galaxy distribution
• Hunting for Galaxies and Halos in simulations with VELOCIraptor
• Testing the lognormality of the galaxy and weak lensing convergence distributions from Dark Energy Survey maps
• An Upper Limit to Arcminute Scale Anisotropy in the Cosmic Microwave Background Radiation at 142 GHz
• A probabilistic approach to emission-line galaxy classification
• The best fit for the observed galaxy Counts-in-Cell distribution function
• The ALHAMBRA survey: evolution of galaxy spectral segregation