{
  "id": "2006.04703",
  "version": "v1",
  "published": "2020-06-08T15:59:02.000Z",
  "updated": "2020-06-08T15:59:02.000Z",
  "title": "Source-count Distribution of Gamma-Ray Blazars",
  "authors": [
    "Lea Marcotulli",
    "Mattia Di Mauro",
    "Marco Ajello"
  ],
  "comment": "16 pages, 9 figures, 5 tables; published in the Astrophysical Journal",
  "journal": "The Astrophysical Journal, Volume 896, Number 1, Pages 6 (2020)",
  "doi": "10.3847/1538-4357/ab8cbd",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "With ten years of operation and an exceptional dataset, the Fermi-Large Area Telescope allows us to unveil the detailed composition of the extragalactic $\\gamma$-ray sky above $\\rm 100\\,MeV$. In this paper, we derive the intrinsic source-count distribution (logN-logS) of extragalactic sources (i.e., blazars) at $|b|>20^{\\circ}$ via the efficiency correction method. With this approach, we are able to measure the distribution down to a photon flux of $\\sim10^{-10}$${\\rm \\, ph \\,\\, cm^{-2} \\, s^{-1}}$ and to an energy flux of $\\sim10^{-12}$${\\rm \\, erg \\,\\, cm^{-2} \\, s^{-1}}$. In both cases the logN-logS becomes flatter at low fluxes. Moreover, we show that this logN-logS is representative of the blazar population (assuming the majority of unassociated sources are blazars) and allows us to constrain its evolution quite effectively. Among recently proposed evolutionary models, we find that the Pure Density Evolution (PDE) model best describes the evolutionary properties of the blazar population and that their integrated emission accounts for $\\sim 50^{+10}_{-5}\\%$ of the total extragalactic \\gm-ray background.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-08T15:59:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gamma-ray blazars",
      "fermi-large area telescope",
      "intrinsic source-count distribution",
      "efficiency correction method",
      "total extragalactic"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}