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We present simulated millimeter-wavelength maps and catalogs of radiogalaxies across the full sky that trace the nonlinear clustering and evolutionof dark matter halos from the Websky simulation at $z<4.6$ and $M_{\rmhalo}>10^{12} M_{\odot}/h$, and the accompanying framework for generating a newsample of radio galaxies from any halo catalog of positions, redshifts, andmasses. Object fluxes are generated using a hybrid approach that combines (1)existing astrophysical halo models of radio galaxies from the literature todetermine the positions and rank-ordering of the observed fluxes with (2)empirical models from the literature based on fits to the observed distributionof flux densities and (3) spectral indices drawn from an empirically-calibratedfrequency-dependent distribution. The resulting population of radio galaxies isin excellent agreement with the number counts, polarization fractions, anddistribution of spectral slopes from the data from observations at millimeterwavelengths from 20-200~GHz, including \emph{Planck}, ALMA, SPT, and ACT. Sincethe radio galaxies are correlated with the existing cosmic infrared background(CIB), Compton-$y$ (tSZ), and CMB lensing maps from Websky, our model makes newpredictions for the cross-correlation power spectra and stacked profiles ofradio galaxies and these other components. These simulations will be importantfor unbiased analysis of a wide variety of observables that are correlated withlarge-scale structure, such as gravitational lensing and SZ clusters.

Simulated catalogs and maps of radio galaxies at millimeter wavelengths in Websky