{
  "id": "2205.07438",
  "version": "v1",
  "published": "2022-05-16T04:22:51.000Z",
  "updated": "2022-05-16T04:22:51.000Z",
  "title": "Hard X-ray emission in Centaurus A",
  "authors": [
    "B. Rani",
    "S. A. Mundo",
    "R. Mushotzky",
    "A. Y. Lien",
    "M. A. Gurwell",
    "J. Y. Kim"
  ],
  "comment": "Accepted for publication in ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We used 13 years of Swift/BAT observations to probe the nature and origin of hard X-ray (14-195 KeV) emission in Centaurus A. Since the beginning of the Swift operation in 2004, significant X-ray variability in the 14-195 KeV band is detected, with mild changes in the source spectrum. Spectral variations became more eminent after 2013, following a softer-when-brighter trend. Using the power spectral density method, we found that the observed hard X-ray photon flux variations are consistent with a red-noise process of slope, $-1.3$ with no evidence for a break in the PSD. We found a significant correlation between hard X-ray and 230 GHz radio flux variations, with no time delay longer than 30 days. The temporal and spectral analysis rules out the ADAF (advection-dominated accretion flow) model, and confirms that the hard X-ray emission is produced in the inner regions of the radio jet.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-05-16T04:22:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hard x-ray emission",
      "hard x-ray photon flux variations",
      "ghz radio flux variations",
      "power spectral density method",
      "spectral analysis rules"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}