{
  "id": "1608.03886",
  "version": "v1",
  "published": "2016-08-12T19:50:37.000Z",
  "updated": "2016-08-12T19:50:37.000Z",
  "title": "On the Rotation Speed of the Milky Way Determined from HI Emission",
  "authors": [
    "M. J. Reid",
    "T. M. Dame"
  ],
  "comment": "4 figures",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The circular rotation speed of the Milky Way at the solar radius, Theta_o, has been estimated to be 220 km/s by fitting the maximum velocity of HI emission as a function of Galactic longitude. This result is in tension with a recent estimate of Theta_o=240 km/s, based on VLBI parallaxes and proper motions from the BeSSeL and VERA surveys for large numbers of high-mass star forming regions across the Milky Way. We find that the rotation curve best fitted to the VLBI data is slightly curved, and that this curvature results in a biased estimate of Theta_o from the HI data when a flat rotation curve is assumed. This relieves the tension between the methods and favors Theta_o=240 km/s.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-08-12T19:50:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "milky way",
      "hi emission",
      "high-mass star forming regions",
      "rotation curve best",
      "flat rotation curve"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}