{
  "id": "1810.10651",
  "version": "v1",
  "published": "2018-10-24T23:06:44.000Z",
  "updated": "2018-10-24T23:06:44.000Z",
  "title": "A gamma-ray periodic modulation in Globular Cluster 47 Tucanae",
  "authors": [
    "Peng-Fei Zhang",
    "Jia-Neng Zhou",
    "Da-Hai Yan",
    "Jing-Zhi Yan",
    "Yi-Zhong Fan",
    "Li Zhang"
  ],
  "comment": "9 pages, 8 figures. Comments welcome",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The Globular Cluster 47 Tucanae was firstly detected in gamma-rays by the Large Area Telescope (LAT) onboard the \\emph{Fermi} Gamma-ray Space Telescope, and the gamma-ray emission has been widely attributed to the millisecond pulsars. In this work, we analyze the Fermi-LAT pass 8 data ranging from 2008 August to 2017 May and report the detection of a modulation with a period of $18.416\\pm0.008$ hours at a significance level of $\\sim 4.8\\sigma$. This is the first time to detect a significant modulation with a period much longer than that of millisecond pulsars in gamma-rays from Globular Clusters. The periodic modulation signal displays in the {\\it Swift}-BAT data as well. The phase-folded Chandra X-ray light curve of a point source may have provided an additional clue. These facts indicate the detection of the first young pulsar binary in gamma-rays in Globular Clusters.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-24T23:06:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "globular cluster",
      "gamma-ray periodic modulation",
      "millisecond pulsars",
      "periodic modulation signal displays",
      "phase-folded chandra x-ray light curve"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}