{
  "id": "1603.01271",
  "version": "v1",
  "published": "2016-03-03T21:00:03.000Z",
  "updated": "2016-03-03T21:00:03.000Z",
  "title": "A Strong Merger Shock in Abell 665",
  "authors": [
    "Sarthak Dasadia",
    "Ming Sun",
    "Craig Sarazin",
    "Andrea Morandi",
    "Maxim Markevitch",
    "Daniel Wik",
    "Luigina Feretti",
    "Gabriele Giovannini",
    "Federica Govoni",
    "Valentina Vacca"
  ],
  "comment": "Accepted for publication in ApJL",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Deep (103 ks) \\chandra\\ observations of Abell 665 have revealed rich structures in this merging galaxy cluster, including a strong shock and two cold fronts. The newly discovered shock has a Mach number of $M$ = 3.0 $\\pm$ 0.6, propagating in front of a cold disrupted cloud. This makes Abell~665 the second cluster where a strong merger shock of $M \\approx$ 3 has been detected, after the Bullet cluster. The shock velocity from jump conditions is consistent with (2.7 $\\pm$ 0.7) $\\times$ 10$^3$ km sec$^{-1}$. The new data also reveal a prominent southern cold front, with potentially heated gas ahead of it. Abell 665 also hosts a giant radio halo. There is a hint of diffuse radio emission extending to the shock at the north, which needs to be examined with better radio data. This new strong shock provides a great opportunity to study the re-acceleration model with the X-ray and radio data combined.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-03-03T21:00:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "strong merger shock",
      "strong shock",
      "prominent southern cold front",
      "better radio data",
      "giant radio halo"
    ],
    "publication": {
      "doi": "10.3847/2041-8205/820/1/L20"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1426082
    }
  }
}