simba: Cosmological simulations with black hole growth and feedback

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ID: 302241
2019
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Abstract
We introduce the simba simulations, the next generation of the mufasa cosmological galaxy formation simulations run with gizmo's meshless finite mass hydrodynamics. simba includes updates to mufasa's sub-resolution star formation and feedback prescriptions, and introduces black hole growth via the torque-limited accretion model of Anglés-Alcázar et al. from cold gas and Bondi accretion from hot gas, along with black hole feedback via kinetic bipolar outflows and X-ray energy. Ejection velocities are taken to be |${\sim } 10^3\,\,{\rm km}\, {\rm s}^{-1}$| at high Eddington ratios, increasing to |${\sim } 8000\,\,{\rm km}\, {\rm s}^{-1}$| at Eddington ratios below 2 per cent, with a constant momentum input of 20L/c. simba further includes an on-the-fly dust production, growth, and destruction model. Our simba run with |$(100h^{-1}\, {\rm Mpc})^3$| and 10243 gas elements reproduces numerous observables, including galaxy stellar mass functions at z = 0−6, the stellar mass–star formation rate main sequence, H i and H2 fractions, the mass–metallicity relation at z ≈ 0, 2, star-forming galaxy sizes, hot gas fractions in massive haloes, and z = 0 galaxy dust properties. However, simba also yields an insufficiently sharp truncation of the z = 0 mass function, and too-large sizes for low-mass quenched galaxies. We show that simba's jet feedback is primarily responsible for quenching massive galaxies.
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Authors Romeel Davé, Daniel Anglés‐Alcázar, Desika Narayanan, Qi Li, Mika Rafieferantsoa, Sarah Appleby
Journal monthly notices of the royal astronomical society
Year 2019
DOI
10.1093/mnras/stz937
URL
https://doi.org/10.1093/mnras/stz937
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