{
  "$schema": "./item.schema.json",
  "id": "sparc-halo-density",
  "type": "publication",
  "cvs": [
    "np"
  ],
  "date": {
    "start": "2018-11"
  },
  "title": "A constant characteristic volume density of dark matter haloes from SPARC rotation curve fits",
  "shortTitle": "A Constant Dark-Matter Halo Density",
  "nickTitle": "SPARC Halo Density",
  "status": "published",
  "entryType": "article",
  "authors": [
    {
      "family": "Li",
      "given": "P.",
      "orcid": "0000-0002-6707-2581",
      "affiliation": "Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA"
    },
    {
      "family": "Lelli",
      "given": "F.",
      "orcid": "0000-0002-9024-9883",
      "affiliation": "European Southern Observatory, Karl-Schwarschild-Strasse 2, D-85748 Garching bei München, Germany"
    },
    {
      "family": "McGaugh",
      "given": "S. S.",
      "orcid": "0000-0002-9762-0980",
      "affiliation": "Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA"
    },
    {
      "family": "Starkman",
      "given": "Nathaniel",
      "me": true,
      "orcid": "0000-0003-3954-3291"
    },
    {
      "family": "Schombert",
      "given": "J. M.",
      "orcid": "0000-0003-2022-1911",
      "affiliation": "Department of Physics, University of Oregon, Eugene, OR 97403, USA"
    }
  ],
  "venue": {
    "journal": "Monthly Notices of the Royal Astronomical Society"
  },
  "arxiv": "1811.00553",
  "doi": "10.1093/mnras/sty2968",
  "links": [
    {
      "rel": "paper",
      "url": "https://doi.org/10.1093/mnras/sty2968"
    }
  ],
  "tags": [
    "dark-matter",
    "extragalactic",
    "dynamics"
  ],
  "citekey": "Li+:2018:sparc-halo-density",
  "abstract": "We study the scaling relations between dark matter (DM) haloes and galaxy discs using 175 galaxies from the SPARC database. We explore two cosmologically motivated DM halo profiles: the Einasto profile from DM-only simulations and the DC14 profile from hydrodynamic simulations. We fit the observed rotation curves using a Markov Chain Monte Carlo method and break the disc-halo degeneracy using near-infrared photometry and ΛCDM-motivated priors. We find that the characteristic volume density $\\rho_{\\rm s}$ of DM haloes is nearly constant over 5 decades in galaxy luminosity. The scale radius $r_{\\rm s}$ and the characteristic surface density $\\rho_{\\rm s} \\cdot r_{\\rm s}$, instead, correlate with galaxy luminosity. These scaling relations provide an empirical benchmark to cosmological simulations of galaxy formation.",
  "highlight": {
    "topic": "extragalactic",
    "image": "highlights/sparc-halo-density.webp",
    "alt": "Characteristic dark-matter density of each SPARC galaxy’s Einasto halo against its 3.6-micron luminosity, coloured by Hubble type from S0 to blue compact dwarf. The points scatter around a flat line across five decades in luminosity.",
    "description": "How dark-matter haloes grow with the galaxies inside them is a direct test of how galaxies form. Fitting the rotation curves of 175 SPARC galaxies shows that bigger galaxies have bigger haloes, but the haloes’ typical density stays about the same — across galaxies that differ a hundred-thousand-fold in brightness."
  }
}