{
  "id": "1601.05958",
  "version": "v1",
  "published": "2016-01-22T11:07:38.000Z",
  "updated": "2016-01-22T11:07:38.000Z",
  "title": "Plasma code for astrophysical charge exchange emission at X-ray wavelengths",
  "authors": [
    "Liyi Gu",
    "Jelle Kaastra",
    "A. J. J. Raassen"
  ],
  "comment": "Accepted for publication in Astronomy & Astrophysics",
  "categories": [
    "astro-ph.HE",
    "astro-ph.EP",
    "astro-ph.GA",
    "astro-ph.IM",
    "physics.atom-ph"
  ],
  "abstract": "Charge exchange X-ray emission provides unique insights into the interactions between cold and hot astrophysical plasmas. Besides its own profound science, this emission is also technically crucial to all observations in the X-ray band, since charge exchange with the solar wind often contributes a significant foreground component that contaminates the signal of interest. By approximating the cross sections resolved to $n$ and $l$ atomic subshells, and carrying out complete radiative cascade calculation, we create a new spectral code to evaluate the charge exchange emission in the X-ray band. Comparing to collisional thermal emission, charge exchange radiation exhibits enhanced lines from large-$n$ shells to the ground, as well as large forbidden-to-resonance ratios of triplet transitions. Our new model successfully reproduces an observed high-quality spectrum of comet C/2000 WM1 (LINEAR), which emits purely by charge exchange between solar wind ions and cometary neutrals. It demonstrates that a proper charge exchange model will allow us to probe remotely the ion properties, including charge state, dynamics, and composition, at the interface between the cold and hot plasmas.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-01-22T11:07:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "astrophysical charge exchange emission",
      "plasma code",
      "x-ray wavelengths",
      "charge exchange x-ray emission",
      "proper charge exchange model"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201527615"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1416618
    }
  }
}