Edinburgh Research Explorer

Simba: Cosmological Simulations with Black Hole Growth and Feedback

Research output: Contribution to journalArticle

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

Related Edinburgh Organisations

Open Access permissions



Original languageEnglish
Pages (from-to)2827-2849
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Early online date3 Apr 2019
Publication statusPublished - 1 Jun 2019


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 Angl\'es-Alc\'azar et al. (2017) 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 ~10^3 km/s at high Eddington ratios, increasing to ~8000 km/s at Eddington ratios below 2%, 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 (100 Mpc/h)^3 and 1024^3 gas elements reproduces numerous observables, including galaxy stellar mass functions at z=0-6, the stellar mass--star formation rate main sequence, HI and H2 fractions, the mass-metallicity relation at z=0 and z=2, star-forming galaxy sizes, hot gas fractions in massive halos, 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.

    Research areas

  • astro-ph.GA, astro-ph.CO

Download statistics

No data available

ID: 81933429