{
  "id": "1912.12690",
  "version": "v1",
  "published": "2019-12-29T16:34:29.000Z",
  "updated": "2019-12-29T16:34:29.000Z",
  "title": "The Splash without a merger",
  "authors": [
    "João A. S. Amarante",
    "Leandro Beraldo e Silva",
    "Victor P. Debattista",
    "Martin C. Smith"
  ],
  "comment": "Resubmitted to ApJL after referee report",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The Milky Way's progenitor experienced several merger events which left their imprints on the stellar halo, including the Gaia-Sausage/Enceladus. Recently, it has been proposed that this event perturbed the proto-disk and gave rise to a metal rich ([Fe/H] $>-1$) low angular momentum ($v_{\\phi} < 100$ km/s) stellar population. These stars have dynamical and chemical properties different from the accreted stellar halo, but are continuous with the canonical thick disk. In this letter, we use a hydrodynamical simulation of an isolated galaxy which develops clumps that produce a bimodal thin$+$thick disk chemistry to explore whether it forms such a population. We demonstrate clump scattering forms a metal-rich, low angular momentum population, without the need for a major merger. We show that, in the simulation, these stars have chemistry, kinematics and density distribution in good agreement with those in the Milky Way.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-12-29T16:34:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stellar halo",
      "low angular momentum population",
      "milky way",
      "demonstrate clump scattering forms",
      "thick disk chemistry"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}