{
  "id": "1103.1002",
  "version": "v1",
  "published": "2011-03-05T03:21:05.000Z",
  "updated": "2011-03-05T03:21:05.000Z",
  "title": "Origin of the Fermi Bubble",
  "authors": [
    "K. S. Cheng",
    "D. O. Chernyshov",
    "V. A. Dogiel",
    "C. -M. Ko",
    "W. -H. Ip"
  ],
  "comment": "16 pages, 1 figure, accepted for publication in ApJ Letters",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Fermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10kpc in diameter north and south of the galactic center (GC). The existence of the bubbles was first evidenced in X-rays detected by ROSAT and later WMAP detected an excess of radio signals at the location of the gamma-ray bubbles. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A$^*$, with a capture rate $3\\times 10^{-5}$yr$^{-1}$ and energy release $\\sim 3\\times 10^{52}$erg per capture can produce very hot plasma $\\sim 10$keV with a wind velocity $\\sim 10^8$cm/s injected into the halo and heat up the halo gas to $\\sim 1$keV, which produces thermal X-rays. The periodic injection of hot plasma can produce shocks in the halo and accelerate electrons to $\\sim$TeV, which produce radio emission via synchrotron radiation, and gamma-rays via inverse Compton scattering with the relic and the galactic soft photons.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-03-05T03:21:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "fermi bubble",
      "hot plasma",
      "periodic star capture processes",
      "produces thermal x-rays",
      "galactic supermassive black hole"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/2041-8205/731/1/L17",
      "journal": "The Astrophysical Journal",
      "year": 2011,
      "month": "Apr",
      "volume": 731,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 891652,
      "adsabs": "2011ApJ...731L..17C"
    }
  }
}