{
  "id": "1805.02588",
  "version": "v1",
  "published": "2018-05-07T15:54:21.000Z",
  "updated": "2018-05-07T15:54:21.000Z",
  "title": "A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter",
  "authors": [
    "Ioana Ciucă",
    "Daisuke Kawata",
    "Shin'ichiro Ando",
    "Francesca Calore",
    "Justin I. Read",
    "Cecilia Mateu"
  ],
  "comment": "9 pages, 6 figures, to be submitted in MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We make a first attempt to find dwarf galaxies in eight \\Fermi-LAT extended, unassociated, source fields using \\Gaia\\ DR2. We probe previously unexplored heliocentric distances of $d<20$~kpc with an extreme-deconvolution (XD) technique. We find no signature of a dwarf galaxy in any of these fields despite \\Gaia's excellent astrometric accuracy. We estimate our detection limits by applying the XD method to mock data, obtaining a conservative limit on the stellar mass of $M_* < 10^4$~M$_{\\sun}$ for $d < 20$\\, kpc. Such a low stellar mass implies either a low-mass subhalo, or a massive stripped-down subhalo. We use an analytic model for stripped subhalos to argue that, given the sizes and fluxes of the \\Fermi-LAT sources, we can reject the hypothesis that they owe to dark matter annihilation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-05-07T15:54:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dwarf galaxy",
      "gaia dr2 search",
      "annihilating dark matter",
      "fermi-lat sources",
      "low stellar mass implies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}