{
  "id": "1710.09348",
  "version": "v1",
  "published": "2017-10-25T17:14:59.000Z",
  "updated": "2017-10-25T17:14:59.000Z",
  "title": "A comparison of the radio and optical time-evolution of HH~1 and 2",
  "authors": [
    "L. F. Rodriguez",
    "A. C. Raga",
    "A. Rodriguez-Kamenetzky",
    "C. Carrasco-Gonzalez"
  ],
  "comment": "To appear in Revista Mexicana de Astronomia y Astrofisica,7 pages, 8 figures",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We present a comparison between the time-evolution over the past $\\sim 20$ years of the radio continuum and H$\\alpha$ emission of HH~1 and 2. We find that the radio continuum and the H$\\alpha$ emission of both objects show very similar trends, with HH~1 becoming fainter and HH~2 brightening quite considerably (about a factor of 2). We also find that the $F_{\\rm H\\alpha}/F_{ff}$ (H$\\alpha$ to free-free continuum) ratio of HH~1 and 2 has higher values than the ones typically found in planetary nebulae (PNe) which we interpret as an indication that the H$\\alpha$ and free-free emission of HH~1/2 is produced in emitting regions with lower temperatures ($\\sim 2000$~K) than the emission of PNe (with $\\sim 10^4$~K).",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-10-25T17:14:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "optical time-evolution",
      "comparison",
      "radio continuum",
      "lower temperatures",
      "free-free emission"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}