text: 487,27,1143548242963001344,610427323,Desika Narayanan,"hey astrotwitter we've got a new paper out led by @UFastro grad student Qi Li! <LINK> we put in a cool new model for dust formation/growth/destruction in cosmo sims to ask what drives variations in the dust to gas ratio/dust to metals ratios in galaxies [1/] In short - the dust to gas ratio is driven in large part by the metallicity of galaxies (due in part to the dependence of metallicity in dust growth rates in the ISM), [2/] There are secondary factors the dust to gas ratio or dust to metals ratio depend on that we tease out with some machine learning techniques, but to first order is mostly set by the metallicity. [3/] For observers and theorists who want a dust[gas] mass from their observed/simulated galaxy, we provide a public code to make it happen!  <LINK>",https://arxiv.org/abs/1906.09277v1,"We present predictions for the evolution of the galaxy dust-to-gas (DGR) and dust-to-metal (DTM) ratios from z=0 to 6, using a model for the production, growth, and destruction of dust grains implemented into the \simba\ cosmological hydrodynamic galaxy formation simulation. In our model, dust forms in stellar ejecta, grows by the accretion of metals, and is destroyed by thermal sputtering and supernovae. Our simulation reproduces the observed dust mass function at z=0, but modestly under-predicts the mass function by ~x3 at z ~ 1-2. The z=0 DGR vs metallicity relationship shows a tight positive correlation for star-forming galaxies, while it is uncorrelated for quenched systems. There is little evolution in the DGR-metallicity relationship between z=0-6. We use machine learning techniques to search for the galaxy physical properties that best correlate with the DGR and DTM. We find that the DGR is primarily correlated with the gas-phase metallicity, though correlations with the depletion timescale, stellar mass and gas fraction are non-negligible. We provide a crude fitting relationship for DGR and DTM vs. the gas-phase metallicity, along with a public code package that estimates the DGR and DTM given a set of galaxy physical properties. ",] The Dust-to-Gas and Dust-to-Metals Ratio in Galaxies from z=0-6,4,"[""hey astrotwitter we've got a new paper out led by @UFastro grad student Qi Li!  <LINK>  we put in a cool new model for dust formation/growth/destruction in cosmo sims to ask what drives variations in the dust to gas ratio/dust to metals ratios in galaxies [1/]"", 'In short - the dust to gas ratio is driven in large part by the metallicity of galaxies (due in part to the dependence of metallicity in dust growth rates in the ISM), [2/]', 'There are secondary factors the dust to gas ratio or dust to metals ratio depend on that we tease out with some machine learning techniques, but to first order is mostly set by the metallicity. [3/]', 'For observers and theorists who want a dust[gas] mass from their observed/simulated galaxy, we provide a public code to make it happen!   https://t.co/fdMWpMDFpA']",19,06,774