{
  "id": "1608.02114",
  "version": "v1",
  "published": "2016-08-06T14:36:56.000Z",
  "updated": "2016-08-06T14:36:56.000Z",
  "title": "Formation and Settling of a Disc Galaxy During the Last 8 Billion Years in a Cosmological Simulation",
  "authors": [
    "Daniel Ceverino",
    "Joel Primack",
    "Avishai Dekel",
    "Susan A. Kassin"
  ],
  "comment": "9 pages, 11 figures, submitted to MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present results of a high-resolution zoom cosmological simulation of the evolution of a low-mass galaxy with a maximum velocity of V=100 km/s at z=0, using the initial conditions from the AGORA project (Kim et al 2014). The final disc-dominated galaxy matches local disc scaling relations. The galaxy evolves from a compact, dispersion-dominated galaxy into a rotation-dominated but dynamically hot disc in about 0.5 Gyr (from z=1.4 to z=1.2). The disc dynamically cools down for the following 7 Gyr, as the gas velocity dispersion decreases over time, in agreement with observations. The primary cause of this slow evolution of velocity dispersion in this low-mass galaxy is stellar feedback. It is related to the decline in gas fraction, and to the associated gravitational disk instability, as the disc slowly settles from a global Toomre Q>1 turbulent disc to a marginally unstable disc (Q=1).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-08-06T14:36:56.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmological simulation",
      "disc galaxy",
      "gas velocity dispersion decreases",
      "disc-dominated galaxy matches local disc",
      "matches local disc scaling relations"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}