SIMBA: Cosmological simulations with black hole growth and feedback

Romeel Davé, Daniel Anglés-Alcázar, Desika Narayanan, Qi Li, Mika H. Rafieferantsoa, Sarah Appleby

Research output: Contribution to journalArticlepeer-review

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 ∼103kms−1 at high Eddington ratios, increasing to ∼8000kms−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−1Mpc)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.
Original languageEnglish
Pages (from-to)2827-2849
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume486
Issue number2
Early online date3 Apr 2019
DOIs
Publication statusPublished - Jun 2019

Keywords

  • astro-ph.GA
  • astro-ph.CO

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