{
  "id": "1501.01040",
  "version": "v1",
  "published": "2015-01-05T23:53:37.000Z",
  "updated": "2015-01-05T23:53:37.000Z",
  "title": "The emerging state of open clusters upon their violent relaxation",
  "authors": [
    "Mario Spera",
    "Roberto Capuzzo-Dolcetta"
  ],
  "comment": "8 pages, 9 figures",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The state after virialization of a small-to-intermediate N-body system depends on its initial conditions; in particular, systems that are, initially, dynamically \"cool\" (virial ratios Q=2T/|Omega| below ~ 0.3) relax violently in few crossing times. This leads to a metastable system (virial ratio ~ 1) which carries a clear signature of mass segregation much before the gentle 2-body relaxation time scale. This result is obtained by a set of high precision N-body simulations of isolated clusters composed of stars of two different masses (in the ratio m_h/m_l=2), and is confirmed also in presence of a massive central object (simulating a black hole of stellar size). We point out that this (quick) mass segregation occurs in two phases: the first one shows up in clumps originated by sub-fragmentation before the deep overall collapse; this segregation is erased during the deep collapse to re-emerge, abruptly, during the second phase that occurs after the first bounce of the system. This way to segregate masses, actual result of a violent relaxation, is an interesting feature also on the astronomical-observational side. In those stellar systems that start their dynamical evolution from cool conditions, this kind of mass segregation adds to the sequent, slow, secular segregation as induced by 2- and 3- body encounters.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-01-05T23:53:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "violent relaxation",
      "open clusters",
      "emerging state",
      "virial ratio",
      "small-to-intermediate n-body system depends"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015arXiv150101040S"
    }
  }
}