Multi-wavelength mock galaxy catalogs of the low-redshift Universe
Aseem Paranjape (IUCAA), Tirthankar Roy Choudhury (NCRA-TIFR), Ravi K., Sheth (UPenn/ICTP)

TL;DR
This paper introduces a new set of realistic mock galaxy catalogs for the low-redshift Universe, combining observational constraints with advanced modeling to simulate galaxy properties and their environment.
Contribution
It develops a comprehensive HOD-based algorithm constrained by multiple surveys, producing detailed mock galaxies with realistic properties and environmental effects.
Findings
Predicts the stellar-HI mass relation for massive galaxies.
Provides the 2-point cross-correlation function of optical and HI samples.
Enables tests for galaxy assembly bias and predictions for HI velocity widths.
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 -band luminosity, and colour, stellar mass and HI mass are populated in an -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,…
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