Multi-wavelength mock galaxy catalogs of the low-redshift Universe

Abstract

We present a new suite of mock galaxy catalogs mimicking the low-redshift Universe, based on an updated halo occupation distribution (HOD) model and a scaling relation between optical properties and the neutral hydrogen (HI) content of galaxies. Our algorithm is constrained by observations of the luminosity function and luminosity- and colour-dependent clustering of SDSS galaxies, as well as the HI mass function and HI-dependent clustering of massive HI-selected galaxies in the ALFALFA survey. Mock central and satellite galaxies with realistic values of $r$-band luminosity, $g-r$ and $u-r$ colour, stellar mass and HI mass are populated in an $N$-body simulation, inheriting a number of properties of the density and tidal environment of their host halos. The host halo of each central galaxy is also `baryonified' with realistic spatial distributions of stars as well as hot and cold gas, along with the corresponding rotation curve. Our default HOD assumes that galaxy properties are a function of group halo mass alone, and can optionally include effects such as galactic conformity and colour-dependent galaxy assembly bias. The mocks predict the relation between the stellar mass and HI mass of massive HI galaxies, as well as the 2-point cross-correlation function of spatially co-located optical and HI-selected samples. They enable novel null tests for galaxy assembly bias, provide predictions for the HI velocity width function, and clarify the origin and universality of the radial acceleration relation in the $\Lambda$CDM framework.

17 pages, 13 figures; v2: minor changes and clarifications, accepted in MNRAS

References in corpus (23)

• The NumPy array: a structure for efficient numerical computation
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• The Radial Acceleration Relation in Rotationally Supported Galaxies
• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• The Importance of Satellite Quenching for the Build-Up of the Red Sequence of Present Day Galaxies
• One Law To Rule Them All: The Radial Acceleration Relation of Galaxies
• A universal model for halo concentrations
• A catalogue of 2D photometric decompositions in the SDSS-DR7 spectroscopic main galaxy sample: preferred models and systematics
• A Halo Model of Galaxy Colors and Clustering in the SDSS
• Satellite abundances around bright isolated galaxies
• Variation of galactic cold gas reservoirs with stellar mass
• Modeling the neutral hydrogen distribution in the post-reionization Universe: intensity mapping
• Strong clustering of underdense regions and the environmental dependence of clustering from Gaussian initial conditions
• Constraining the HI-Halo Mass Relation From Galaxy Clustering
• The HI Mass Function and Velocity Width Function of Void Galaxies in the Arecibo Legacy Fast ALFA Survey
• Mock halo catalogs: assigning unresolved halo properties using correlations with local halo environment
• Global analysis of luminosity- and colour-dependent galaxy clustering in the Sloan Digital Sky Survey
• The Distribution of Neutral Hydrogen in the Color-Magnitude Plane of Galaxies
• Exploring Neutral Hydrogen and Galaxy Evolution with the SKA

Cited by in corpus (9)

• Generating mock galaxy catalogues for flux-limited samples like the DESI Bright Galaxy Survey
• The phenomenology of the external field effect in cold dark matter models
• ΛCDM with baryons vs. MOND: the time evolution of the universal acceleration scale in the Magneticum simulations
• The quasi-adiabatic relaxation of haloes in the IllustrisTNG and EAGLE cosmological simulations
• HI HOD -- I. The Halo Occupation Distribution of HI Galaxies
• A test of invariance of dark matter halo surface density using multiwavelength mock galaxy catalogues
• The multi-dimensional halo assembly bias can be preserved when enhancing halo properties with HALOSCOPE
• A test of invariance of halo surface density for FIRE-2 simulations with cold dark matter and self-interacting dark matter
• Joint Optical-HI mock catalogues and prospects for upcoming HI surveys