{
  "id": "1710.10765",
  "version": "v1",
  "published": "2017-10-30T04:10:39.000Z",
  "updated": "2017-10-30T04:10:39.000Z",
  "title": "Radio Transients from Newborn Black Holes",
  "authors": [
    "Kazumi Kashiyama",
    "Kenta Hotokezaka",
    "Kohta Murase"
  ],
  "comment": "11 pages, 10 figures",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We consider radio emission from a newborn black hole (BH), which is accompanied by a mini-disk with a mass of $\\lesssim M_\\odot$. Such a disk can be formed from an outer edge of the progenitor's envelope, especially for metal-poor massive stars and/or massive stars in close binaries. The disk accretion rate is typically super-Eddington and an ultrafast outflow with a velocity of $\\sim 0.1\\mbox{-}0.3\\,c$ will be launched into the circumstellar medium. The outflow forms a collisionless shock, and electrons are accelerated and emit synchrotron emission in radio bands with a flux of $\\sim 10^{26-30} \\ \\rm erg \\ s^{-1} \\ Hz^{-1}$ days to decades after the BH formation. The model predicts not only a fast UV/optical transient but also quasi-simultaneous inverse-Compton X-ray emission $\\sim$ a few days after the BH formation, and the discovery of the radio counterpart with coordinated searches will enable us to identify this type of transients. The occurrence rate can be $0.1-10 \\ \\%$ of the core-collapse supernova rate, which makes them a promising target of dedicated radio observations such as the Jansky VLA Sky Survey.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-10-30T04:10:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "newborn black hole",
      "radio transients",
      "bh formation",
      "jansky vla sky survey",
      "disk accretion rate"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}