{
  "id": "0909.0680",
  "version": "v2",
  "published": "2009-09-03T18:02:57.000Z",
  "updated": "2009-10-04T14:46:59.000Z",
  "title": "Kinematic constraints on the stellar and dark matter content of spiral and S0 galaxies",
  "authors": [
    "Michael J. Williams",
    "Martin Bureau",
    "Michele Cappellari"
  ],
  "comment": "Accepted for publication in MNRAS. Minor proof corrections incorporated",
  "journal": "Mon.Not.Roy.Astron.Soc. 400:1665,2010",
  "doi": "10.1111/j.1365-2966.2009.15582.x",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "(Abridged) We present mass models of a sample of 14 spiral and 14 S0 galaxies that constrain their stellar and dark matter content. For each galaxy we derive the stellar mass distribution from near-infrared photometry under the assumptions of axisymmetry and a constant Ks-band stellar mass-to-light ratio, (M/L)_Ks. To this we add a dark halo assumed to follow a spherically symmetric NFW profile and a correlation between concentration and dark mass within the virial radius, M_DM. We solve the Jeans equations for the corresponding potential under the assumption of constant anisotropy in the meridional plane, beta_z. By comparing the predicted second velocity moment to observed long-slit stellar kinematics, we determine the three best-fitting parameters of the model: (M/L)_Ks, M_DM and beta_z. These simple axisymmetric Jeans models are able to accurately reproduce the wide range of observed stellar kinematics, which typically extend to ~2-3 Re or, equivalently, ~0.5-1 R_25. We find a median stellar mass-to-light ratio at Ks-band of 1.09 (solar units) with an rms scatter of 0.31. We present preliminary comparisons between this large sample of dynamically determined stellar mass-to-light ratios and the predictions of stellar population models. The stellar population models predict slightly lower mass-to-light ratios than we measure. The mass models contain a median of 15 per cent dark matter by mass within an effective radius Re, and 49 per cent within the optical radius R_25. Dark and stellar matter contribute equally to the mass within a sphere of radius 4.1 Re or 1.0 R_25. There is no evidence of any significant difference in the dark matter content of the spirals and S0s in our sample.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-10-04T14:46:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dark matter content",
      "s0 galaxies",
      "ks-band stellar mass-to-light ratio",
      "kinematic constraints",
      "determined stellar mass-to-light ratios"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Wiley-Blackwell",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2009,
      "month": "Dec",
      "volume": 400,
      "number": 4,
      "pages": 1665
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 830283,
      "adsabs": "2009MNRAS.400.1665W"
    }
  }
}