MUFASA

Galaxy formation simulations with meshless hydrodynamics

Romeel S Dave, Robert Thompson, Philip F. Hopkins

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

We present the MUFASA suite of cosmological hydrodynamic simulations, which employs the GIZMO meshless finite mass (MFM) code including H2-based star formation, nine-element chemical evolution, two-phase kinetic outflows following scalings from the Feedback in Realistic Environments zoom simulations, and evolving halo mass-based quenching. Our fiducial (50 h-1 Mpc)3 volume is evolved to z = 0 with a quarter billion elements. The predicted galaxy stellar mass functions (GSMFs) reproduces observations from z = 4 → 0 to ≲1.2σ in cosmic variance, providing an unprecedented match to this key diagnostic. The cosmic star formation history and stellar mass growth show general agreement with data, with a strong archaeological downsizing trend such that dwarf galaxies form the majority of their stars after z ~ 1. We run 25 and 12.5 h-1 Mpc volumes to z = 2 with identical feedback prescriptions, the latter resolving all hydrogen-cooling haloes, and the three runs display fair resolution convergence. The specific star formation rates broadly agree with data at z = 0, but are underpredicted at z ~ 2 by a factor of 3, re-emphasizing a longstanding puzzle in galaxy evolution models. We compare runs usingMFM and two flavours of smoothed particle hydrodynamics, and show that the GSMF is sensitive to hydrodynamics methodology at the ~×2 level, which is sub-dominant to choices for parametrizing feedback.

Original languageEnglish (US)
Article numberstw1862
Pages (from-to)3265-3284
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume462
Issue number3
DOIs
StatePublished - Nov 1 2016
Externally publishedYes

Fingerprint

galactic evolution
stellar mass
hydrodynamics
galaxies
star formation
halos
simulation
chemical evolution
dwarf galaxies
star formation rate
quenching
histories
methodology
chemical element
trends
cooling
scaling
stars
kinetics
hydrogen

Keywords

  • Galaxies: evolution
  • Galaxies: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

MUFASA : Galaxy formation simulations with meshless hydrodynamics. / Dave, Romeel S; Thompson, Robert; Hopkins, Philip F.

In: Monthly Notices of the Royal Astronomical Society, Vol. 462, No. 3, stw1862, 01.11.2016, p. 3265-3284.

Research output: Contribution to journalArticle

Dave, Romeel S ; Thompson, Robert ; Hopkins, Philip F. / MUFASA : Galaxy formation simulations with meshless hydrodynamics. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 462, No. 3. pp. 3265-3284.
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