{
  "id": "1710.11112",
  "version": "v1",
  "published": "2017-10-30T17:56:32.000Z",
  "updated": "2017-10-30T17:56:32.000Z",
  "title": "Observational Signature of High Spin at the Event Horizon Telescope",
  "authors": [
    "Samuel E. Gralla",
    "Alexandru Lupsasca",
    "Andrew Strominger"
  ],
  "comment": "34 pages, 5 figures. Related videos available at https://youtu.be/ZRfTj5JKPkA and https://youtu.be/K0jEa0Q9NJA",
  "categories": [
    "astro-ph.HE",
    "gr-qc",
    "hep-th"
  ],
  "abstract": "We analytically compute the observational appearance of an isotropically emitting point source orbiting near a rapidly spinning black hole. The primary image moves on a vertical line segment, in contrast to the primarily horizontal motion of the spinless case. Secondary images, also on the vertical line, display a rich caustic structure. If detected, this unique signature could serve as a \"smoking gun\" for a high spin black hole in nature.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-10-30T17:56:32.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "event horizon telescope",
      "observational signature",
      "emitting point source orbiting",
      "high spin black hole",
      "primary image moves"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 34,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}