{
  "id": "1604.01418",
  "version": "v1",
  "published": "2016-04-05T20:32:11.000Z",
  "updated": "2016-04-05T20:32:11.000Z",
  "title": "MUFASA: Galaxy Formation Simulations With Meshless Hydrodynamics",
  "authors": [
    "Romeel Davé",
    "Robert J. Thompson",
    "Philip F. Hopkins"
  ],
  "comment": "20 pages, submitted to MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "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 Mpc/h)^3 volume is evolved to z=0 with a quarter billion particles, The predicted galaxy stellar mass functions (GSMF) reproduce observations from z=4-0 to <1.2sigma 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 Mpc/h and 12.5 Mpc/h volumes to z=2 with identical feedback prescriptions, the latter resolving all hydrogen-cooling halos, 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 three, re-emphasizing a longstanding puzzle in galaxy evolution models. We compare runs using MFM and two flavours of Smoothed Particle Hydrodynamics, and show that the GSMF is sensitive to hydrodynamics methodology at the ~x2 level, which is sub-dominant to choices for parameterising feedback.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-04-05T20:32:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galaxy formation simulations",
      "galaxy stellar mass functions",
      "formation rates broadly agree",
      "meshless hydrodynamics",
      "star formation rates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016arXiv160401418D"
    }
  }
}