TL;DR
This study uses the Dark Sage semi-analytic model to analyze the relationship between galaxy gas content, angular momentum, and disc stability, revealing key mechanisms affecting gas retention and their observational challenges.
Contribution
It demonstrates a clear correlation between gas fraction and angular momentum in galaxies within a cosmological framework, linking simulation results with analytic predictions.
Findings
Dark Sage reproduces observed gas-angular momentum correlation.
A tight q--f_atm sequence exists for star-forming galaxies.
Mergers and ram-pressure stripping significantly reduce gas content.
Abstract
We explore the connection between the atomic gas fraction, f_atm, and `global disc stability' parameter, q, of galaxies within a fully cosmological context by examining galaxies in the Dark Sage semi-analytic model. The q parameter is determined by the ratio of disc specific angular momentum to mass. Dark Sage is well suited to our study, as it includes the numerical evolution of one-dimensional disc structure, making both j_disc and q predicted quantities. We show that Dark Sage produces a clear correlation between gas fraction and j_disc at fixed disc mass, in line with recent results from observations and hydrodynamic simulations. This translates to a tight q--f_atm sequence for star-forming central galaxies, which closely tracks the analytic prediction of Obreschkow et al. The scatter in this sequence is driven by the probability distribution function of mass as a function of j (PDF…
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