Generating Synthetic Cosmological Data with GalSampler

Abstract

As part of the effort to meet the needs of the Large Synoptic Survey Telescope Dark Energy Science Collaboration (LSST DESC) for accurate, realistically complex mock galaxy catalogs, we have developed GalSampler, an open-source python package that assists in generating large volumes of synthetic cosmological data. The key idea behind GalSampler is to recast hydrodynamical simulations and semi-analytic models as physically-motivated galaxy libraries. GalSampler populates a new, larger-volume halo catalog with galaxies drawn from the baseline library; by using weighted sampling guided by empirical modeling techniques, GalSampler inherits statistical accuracy from the empirical model and physically-motivated complexity from the baseline library. We have recently used GalSampler to produce the cosmoDC2 extragalactic catalog made for the LSST DESC Data Challenge 2. Using cosmoDC2 as a guiding example, we outline how GalSampler can continue to support ongoing and near-future galaxy surveys such as the Dark Energy Survey (DES), the Dark Energy Spectroscopic Instrument (DESI), WFIRST, and Euclid.

12 pages, 5 figures

References in corpus (79)

• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies
• The physical properties of star forming galaxies in the low redshift universe
• The broken hierarchy of galaxy formation
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• The hierarchical formation of the brightest cluster galaxies
• Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• Physical Models of Galaxy Formation in a Cosmological Framework
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• Constraints on the relationship between stellar mass and halo mass at low and high redshift
• The size distribution of galaxies in the Sloan Digital Sky Survey
• A Unified Model for the Evolution of Galaxies and Quasars
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• A Comprehensive Analysis of Uncertainties Affecting the Stellar Mass - Halo Mass Relation for 0<z<4
• Clustering of Galaxies in a Hierarchical Universe: I. Methods and Results at z=0
• MultiDark simulations: the story of dark matter halo concentrations and density profiles
• Halos and galaxies in the standard cosmological model: results from the Bolshoi simulation
• The Dark Side of the Halo Occupation Distribution
• LSST Science Book, Version 2.0
• Theoretical Models of the Halo Occupation Distribution: Separating Central and Satellite Galaxies
• The Connection between Galaxies and their Dark Matter Halos
• Modeling Luminosity-Dependent Galaxy Clustering Through Cosmic Time
• Adaptive Refinement Tree - a new high-resolution N-body code for cosmological simulations
• CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
• Constraining Galaxy Formation and Cosmology with the Conditional Luminosity Function of Galaxies
• Halo concentrations in the standard LCDM cosmology
• Gravitationally Consistent Halo Catalogs and Merger Trees for Precision Cosmology
• The star formation history of mass-selected galaxies in the COSMOS field
• New constraints on the evolution of the stellar-to-dark matter connection: a combined analysis of galaxy-galaxy lensing, clustering, and stellar mass functions from z=0.2 to z=1
• EMERGE - An empirical model for the formation of galaxies since $z\sim 10$
• A unified multi-wavelength model of galaxy formation
• The Halo Occupation Distribution and the Physics of Galaxy Formation
• Galacticus: A Semi-Analytic Model of Galaxy Formation
• The size - virial radius relation of galaxies
• Halo assembly bias and its effects on galaxy clustering
• The Anisotropic Distribution of Galactic Satellites
• Galaxy And Mass Assembly (GAMA): mass-size relations of z$<$0.1 galaxies subdivided by Sérsic index, colour and morphology
• Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys
• The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology
• Shark: introducing an open source, free and flexible semi-analytic model of galaxy formation
• Intrinsic Correlation of Galaxy Shapes: Implications for Weak Lensing Measurements
• Halo and Subhalo Demographics with Planck Cosmological Parameters: Bolshoi-Planck and MultiDark-Planck Simulations
• Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample
• Cosmological Constraints from a Combination of Galaxy Clustering and Lensing -- I. Theoretical Framework
• HACC: Simulating Sky Surveys on State-of-the-Art Supercomputing Architectures
• Semi-analytical model of galaxy formation with high-resolution N-body simulations
• The Dark Side of Galaxy Color
• The MultiDark Database: Release of the Bolshoi and MultiDark Cosmological Simulations
• An algorithm to build mock galaxy catalogues using MICE simulations
• A Halo Model of Galaxy Colors and Clustering in the SDSS
• The WiggleZ Dark Energy Survey: Direct constraints on blue galaxy intrinsic alignments at intermediate redshifts
• A halo model for intrinsic alignments of galaxy ellipticities
• The Shapes and Alignments of Dark Matter Halos
• The evolution of the mass-size relation for early type galaxies from z~1 to the present: dependence on environment, mass-range and detailed morphology
• The Carnegie-Irvine Galaxy Survey. III. The Three-Component Structure of Nearby Elliptical Galaxies
• Forward Modeling of Large-Scale Structure: An open-source approach with Halotools
• CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST
• The Dark Side of Galaxy Color: evidence from new SDSS measurements of galaxy clustering and lensing
• The LSST Dark Energy Science Collaboration (DESC) Science Requirements Document
• Cosmological Information in the Intrinsic Alignments of Luminous Red Galaxies
• Galaxy formation in the Planck cosmology - IV. Mass and environmental quenching, conformity and clustering
• Intrinsic alignments of galaxies in the MassiveBlack-II simulation: analysis of two-point statistics
• Relations Between the Sizes of Galaxies and their Dark Matter Halos at Redshifts $0<z<3$
• nIFTy Cosmology: Galaxy/halo mock catalogue comparison project on clustering statistics
• Painting galaxies into dark matter halos using machine learning
• The Millennium Run Observatory: First Light
• Machine Learning and Cosmological Simulations II: Hydrodynamical Simulations
• The impact of baryonic physics on the shape and radial alignment of substructures in cosmological dark matter haloes
• Machine Learning and Cosmological Simulations I: Semi-Analytical Models
• The evolution of the stellar mass versus halo mass relationship
• Modeling color-dependent galaxy clustering in cosmological simulations
• DES Y1 Results: Validating cosmological parameter estimation using simulated Dark Energy Surveys
• DESCQA: An Automated Validation Framework for Synthetic Sky Catalogs
• The galaxy correlation function as a constraint on galaxy formation physics

Cited by in corpus (20)

• A machine learning approach to mapping baryons onto dark matter haloes using the EAGLE and C-EAGLE simulations
• Correlations between Triaxial Shapes and Formation History of Dark Matter Haloes
• ADDGALS: Simulated Sky Catalogs for Wide Field Galaxy Surveys
• Machine Learning for Observational Cosmology
• A Joint Roman Space Telescope and Rubin Observatory Synthetic Wide-Field Imaging Survey
• The LSST-DESC 3x2pt Tomography Optimization Challenge
• The Outer Stellar Mass of Massive Galaxies: A Simple Tracer of Halo Mass with Scatter Comparable to Richness and Reduced Projection Effects
• DSPS: Differentiable Stellar Population Synthesis
• A Composite Likelihood Approach for Inference under Photometric Redshift Uncertainty
• Hybrid analytic and machine-learned baryonic property insertion into galactic dark matter haloes
• Simulating image coaddition with the Nancy Grace Roman Space Telescope: I. Simulation methodology and general results
• Farpoint: A High-Resolution Cosmology Simulation at the Gigaparsec Scale
• Mock halo catalogs: assigning unresolved halo properties using correlations with local halo environment
• OpenUniverse2024: A shared, simulated view of the sky for the next generation of cosmological surveys
• Improving Photometric Redshift Estimates with Training Sample Augmentation
• Chromatic Effects on the PSF and Shear Measurement for the Roman Space Telescope High-Latitude Wide Area Survey
• Improved Tomographic Binning of 3x2pt Lens Samples: Neural Network Classifiers and Optimal Bin Assignments
• Red Dragon: A Redshift-Evolving Gaussian Mixture Model for Galaxies
• Optimizing the Roman Space Telescope High-Latitude Wide Area Survey for mitigating chromatic PSF effects on shear measurement
• Deep Learning generated observations of galaxy clusters from dark-matter-only simulations