{
  "id": "2006.12519",
  "version": "v1",
  "published": "2020-06-22T18:00:05.000Z",
  "updated": "2020-06-22T18:00:05.000Z",
  "title": "Physical Conditions and Particle Acceleration in the Kiloparsec Jet of Centaurus A",
  "authors": [
    "Takahiro Sudoh",
    "Dmitry Khangulyan",
    "Yoshiyuki Inoue"
  ],
  "comment": "Main text 6 pages, 2 figures. Comments welcome",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "The non-thermal emission from the kiloparsec-scale jet of Centaurus A exhibits two notable features, bright diffuse emission and many compact knots, which have been intensively studied in X-ray and radio observations. H.E.S.S. recently reported that the very-high-energy gamma-ray emission from this object is extended along the jet direction beyond a kiloparsec from the core. Here, we combine these observations to constrain the physical conditions of the kpc-jet and study the origin of the non-thermal emission. We show that the diffuse jet is weakly magnetized ($\\eta_B\\sim10^{-2}$) and energetically dominated by thermal particles. We also show that knots are the sites of both amplified magnetic field and particle (re-)acceleration. To keep sufficient energy in thermal particles, the magnetic and non-thermal particle energy in the knot regions are tightly constrained. The most plausible condition is an energy equipartition between them, $\\eta_B\\sim\\eta_e\\sim0.1$. Such weak magnetic energy implies that particles in the knots are in the slow cooling regime. We suggest that the entire kpc-scale diffuse emission could be powered by particles that are accelerated at and escaped from knots.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-22T18:00:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "physical conditions",
      "particle acceleration",
      "kiloparsec jet",
      "weak magnetic energy implies",
      "entire kpc-scale diffuse emission"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}