{
  "id": "astro-ph/0301362",
  "version": "v1",
  "published": "2003-01-17T17:39:01.000Z",
  "updated": "2003-01-17T17:39:01.000Z",
  "title": "EGRET upper limits on the high-energy gamma-ray emission of galaxy clusters",
  "authors": [
    "O. Reimer",
    "M. Pohl",
    "P. Sreekumar",
    "J. R. Mattox"
  ],
  "comment": "13 pages, 6 figures, 2 tables (emulateapj), accepted for publication in ApJ",
  "journal": "Astrophys.J.588:155-164,2003",
  "doi": "10.1086/374046",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We report EGRET upper limits on the high-energy gamma-ray emission from clusters of galaxies. EGRET observations between 1991 and 2000 were analyzed at positions of 58 individual clusters from a flux-limited sample of nearby X-ray bright galaxy clusters. Subsequently, a coadded image from individual galaxy clusters has been analyzed using an adequately adapted diffuse gamma-ray foreground model. The resulting 2 sigma upper limit for the average cluster is \\~ 6 x 10^{-9} cm^{-2} s^{-1} for E > 100 MeV. Implications of the non--detection of prominent individual clusters and of the general inability to detect the X-ray brightest galaxy clusters as a class of gamma-ray emitters are discussed. We compare our results with model predictions on the high-energy gamma-ray emission from galaxy clusters as well as with recent claims of an association between unidentified or unresolved gamma-ray sources and Abell clusters of galaxies and find these contradictory.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2003-01-17T17:39:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high-energy gamma-ray emission",
      "egret upper limits",
      "diffuse gamma-ray foreground model",
      "x-ray bright galaxy clusters",
      "adapted diffuse gamma-ray foreground"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 611810
    }
  }
}