{
  "id": "1702.05280",
  "version": "v1",
  "published": "2017-02-17T09:47:12.000Z",
  "updated": "2017-02-17T09:47:12.000Z",
  "title": "Long-term study of the Double Pulsar J0737-3039 with XMM-Newton: spectral analysis",
  "authors": [
    "Elise Egron",
    "Alberto Pellizzoni",
    "Andy Pollock",
    "Maria Noemi Iacolina",
    "Nazar Robertovich Ikhsanov",
    "Andrea Possenti",
    "Marco Marongiu"
  ],
  "comment": "13 pages, 4 figures, Accepted for publication in the Astrophysical Journal",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present a long-term spectral monitoring of the unique Double Pulsar binary PSR J0737-3039 corresponding to two \"Large Programs\" performed by XMM-Newton in 2006 and 2011. Spectral variability of pulsar emission in soft X-rays is not evident over 5 years, despite the significant relativistic spin precession in the considered time span (about 25deg). We provide, for the first time, evidence of hard X-ray emission from the system in the 5-8 keV energy band. The standard spectral analysis was coupled to the energy dependent spatial analysis to confirm this excess, most likely ascribed to iron line emission. The Fe K-alpha emission line at 6.4-6.97 keV was previously unheard-of in non-accreting binary systems and could testify to the presence of a relic disk that survived the supernova explosions that terminated the lives of the Double Pulsar's stellar progenitors. The existence of a relic disk in this system reinforces speculation about the presence of similar structures around other peculiar classes of isolated neutron stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-02-17T09:47:12.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spectral analysis",
      "long-term study",
      "xmm-newton",
      "relic disk",
      "fe k-alpha emission line"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}