{
  "id": "1405.4318",
  "version": "v2",
  "published": "2014-05-16T21:51:56.000Z",
  "updated": "2014-12-05T16:27:42.000Z",
  "title": "Baryonic and dark matter distribution in cosmological simulations of spiral galaxies",
  "authors": [
    "Pol Mollitor",
    "Emmanuel Nezri",
    "Romain Teyssier"
  ],
  "comment": "matches version accepted in MNRAS, 17 pages, 15 figures, text improved, satellite section extended",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We study three cosmological hydrodynamical simulations of Milky Way(MW)-sized halos including a comparison with the dark matter(DM)-only counterparts. We find one of our simulated galaxies with interesting MW-like features. Thanks to a consistently tuned star formation rate and supernovae feedback we obtain an extended disk and a flat rotation curve with a satisfying circular velocity and a reasonable DM density in the solar neighbourhood. Mimicking observational methods, we re-derive the stellar mass and obtain stellar-to-halo mass ratios reduced by more than 50\\%. We show the interaction between the baryons and the dark matter which is first contracted by star formation and then cored by feedback processes. Indeed, we report an unprecedentedly observed effect in the DM density profile consisting of a central core combined with an adiabatic contraction at larger galactic radii. The cores obtained are typically $\\sim$ 5 kpc large. Moreover, this also impacts the DM density at the solar radius. In our simulation resembling most to the MW, the density is raised from 0.23 GeV/cm$^3$ in the dark matter only run to 0.36 GeV/cm$^3$ (spherical shell) or 0.54 GeV/cm$^3$ (circular ring) in the hydrodynamical run. Studying the subhalos, the dark matter within luminous satellites is also affected by baryonic processes and exihibits cored profiles whereas dark satellites are cuspy. We find a shift in mass compared to DM-only simulations and obtain, for halos in the lower MW mass range, a distribution of luminous satellites comparable to the MW spheroidal dwarf galaxies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-05-16T21:51:56.000Z",
      "abstract": "We study three high resolution cosmological hydrodynamical simulations of Milky Way-sized halos including a comparison with the corresponding DM-only counterparts performed with the adaptive mesh refinement code RAMSES. We analyse the stellar and the gas distribution and find one of our simulated galaxies with interesting Milky Way-like features with regard to several observational tests. Thanks to consistently tuned star formation rate and supernovae feedback, we manage to obtain an extended disk and a flat rotation curve with a circular velocity and a dark matter density in the solar neighbourhood in agreement with observations. With a careful look at the derivation of the stellar-to-halo mass ratio, we also obtain competitive values for this criterion. Concerning the dark matter distribution, we explicitly show the interaction with the baryons and show how the dark matter is first contracted by star formation and then cored by feedback processes. Analysing the clump spectrum, we find a shift in mass with regard to corresponding DM-only simulations and obtain a distribution of luminous satellites comparable with the Milky Way spheroidal dwarf galaxies.",
      "comment": "16 pages, 14 figures",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2014-12-05T16:27:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dark matter distribution",
      "spiral galaxies",
      "cosmological simulations",
      "tuned star formation rate",
      "dm density"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2466",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Feb",
      "volume": 447,
      "number": 2,
      "pages": 1353
    },
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1297010,
      "adsabs": "2015MNRAS.447.1353M"
    }
  }
}