Measurements of the angular momentum–mass relations in the Simba simulation

Abstract

We present measurements of the specific angular momentum content (𝑗) of galaxies drawn from the Simba cosmological hydrodynamic simulations. These relations are broadly consistent with a variety of empirical measurements. We confirm the observational result that the scatter in the stellar 𝑗–𝑀 relation is driven largely by H I content, and measure the dependence of its scatter on the deviations of galaxies from other important scaling relations. For a given stellar mass, H i-rich/poor galaxies have more/less-than-average stellar specific angular momentum.