Euclid preparation. Simulating thousands of Euclid spectroscopic skies

Abstract

We present two extensive sets of 3500+1000 simulations of dark matter haloes on the past light cone, and two corresponding sets of simulated (`mock') galaxy catalogues that represent the Euclid spectroscopic sample. The simulations were produced with the latest version of the PINOCCHIO code, and provide the largest, public set of simulated skies. Mock galaxy catalogues were obtained by populating haloes with galaxies using an halo occupation distribution (HOD) model extracted from the Flagship galaxy catalogue provided by Euclid Collaboration. The Geppetto set of 3500 simulated skies was obtained by tiling a 1.2 Gpc/h box to cover a light-cone whose sky footprint is a circle of 30 deg radius, for an area of 2763 deg${}^2$ and a minimum halo mass of $1.5\times 10^{11}$ Msun/h. The relatively small box size makes this set unfit for measuring very large scales. The EuclidLargeBox set consists of 1000 simulations of 3.38 Gpc/h, with the same mass resolution and a footprint that covers half of the sky, excluding the Milky Way zone of avoidance. From this we produced a set of 1000 EuclidLargeMocks on the 30 deg radius footprint, whose comoving volume is fully contained in the simulation box. We validated the two sets of catalogues by analysing number densities, power spectra, and 2-point correlation functions, showing that the Flagship spectroscopic catalogue is consistent with being one of the realisations of the simulated sets, although we noticed small deviations limited to the quadrupole at k>0.2 h/Mpc. We show cosmological parameter inference from these catalogues and demonstrate that using one realisation of EuclidLargeMocks in place of the Flagship mock produces the same posteriors, to within the expected shift given by sample variance. These simulated skies will be used for the galaxy clustering analysis of Euclid's Data Release 1 (DR1).

arXiv comment19 pages, A&A in press

References in corpus (44)

• The Structure of Cold Dark Matter Halos
• The cosmological simulation code GADGET-2
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Transients from Initial Conditions in Cosmological Simulations
• Euclid. I. Overview of the Euclid mission
• Solving Large Scale Structure in Ten Easy Steps with COLA
• The Quijote simulations
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: a large sample of mock galaxy catalogues
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• An accurate physical model for halo concentrations
• PINOCCHIO: pinpointing orbit-crossing collapsed hierarchical objects in a linear density field
• FastPM: a new scheme for fast simulations of dark matter and halos
• A Measurement of the Quadrupole Power Spectrum in the Clustering of the 2dF QSO Survey
• EZmocks: extending the Zel'dovich approximation to generate mock galaxy catalogues with accurate clustering statistics
• Measuring line-of-sight dependent Fourier-space clustering using FFTs
• An accurate tool for the fast generation of dark matter halo catalogs
• Euclid. III. The NISP Instrument
• Modelling the number density of Halpha emitters for future spectroscopic near-IR space missions
• Euclid. II. The VIS Instrument
• The mass-Peak Patch algorithm for fast generation of deep all-sky dark matter halo catalogues and its N-Body validation
• Comparing approximate methods for mock catalogues and covariance matrices II: Power spectrum multipoles
• nIFTy Cosmology: Galaxy/halo mock catalogue comparison project on clustering statistics
• Comparing approximate methods for mock catalogues and covariance matrices I: correlation function
• Comparing approximate methods for mock catalogues and covariance matrices III: Bispectrum
• Improving fast generation of halo catalogs with higher-order Lagrangian perturbation theory
• Constraining the halo bispectrum in real and redshift space from perturbation theory and non-linear stochastic bias
• Toward a robust inference method for the galaxy bispectrum: likelihood function and model selection
• Cosmological parameters from the likelihood analysis of the galaxy power spectrum and bispectrum in real space
• Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering
• Euclid. V. The Flagship galaxy mock catalogue: a comprehensive simulation for the Euclid mission
• Bias deconstructed: Unravelling the scale dependence of halo bias using real space measurements
• BAM: Bias Assignment Method to generate mock catalogs
• The Halo Bispectrum Multipoles in Redshift Space
• COMET: Clustering Observables Modelled by Emulated perturbation Theory
• Euclid: Effect of sample covariance on the number counts of galaxy clusters
• Euclid preparation. XLI. Galaxy power spectrum modelling in real space
• Testing approximate predictions of displacements of cosmological dark matter halos
• COVMOS: a new Monte Carlo approach for galaxy clustering analysis
• Fitting covariance matrix models to simulations
• $\text{PineTree}$: A generative, fast, and differentiable halo model for wide-field galaxy surveys
• A blind method to recover the mask of a deep galaxy survey
• Uncertainty in the visibility mask of a survey and its effects on the clustering of biased tracers

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