{
  "id": "1102.2746",
  "version": "v2",
  "published": "2011-02-14T12:00:18.000Z",
  "updated": "2011-02-16T08:22:38.000Z",
  "title": "Population study for gamma-ray pulsars; II Millisecond pulsars",
  "authors": [
    "J. Takata",
    "Y. Wang",
    "K. S. Cheng"
  ],
  "comment": "30 pages, 10 figures, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The population of $\\gamma$-ray emitting millisecond pulsars (MSPs) is studied by using Monte-Carlo techniques. We simulate the Galactic distributions of the MSPs, and apply the outer gap model for the $\\gamma$-ray emission from each simulated MSP. We take into account the dependence of the observed $\\gamma$-ray flux on the viewing angle and inclination angle, which is the angle between the rotation axis and the magnetic axis, respectively. Using the sensitivity of the six-month long observation of the $Fermi$ telescope and radio sensitivities of existing pulsar surveys, 9-13 radio-selected and 22-35 $\\gamma$-ray-selected pulsars are detected within our simulation. The statistical properties of the simulated population are consistent with the $Fermi$ observations. Scaling the observed sensitivity $\\propto \\sqrt{T}$, where $T$ is the length of observation time, the present model predicts that over the 5-year mission $Fermi$ would detect 15-22 radio-selected $\\gamma$-ray MSPs, and 95-152 $\\gamma$-ray-selected MSPs. Our simulation also predicts that about 100 (or 200-300) $\\gamma$-ray MSPs with a flux larger $F\\ge 10^{-11}~\\mathrm{erg/cm^2 s}$ (or $5\\times 10^{-12}~\\mathrm{erg/cm^2 s}$) irradiate the Earth. With the present sensitivities of the radio surveys, most of them are categorized as $\\gamma$-ray-selected pulsars, indicating that most of the $\\gamma$-ray MSPs have been missed by the present $Fermi$ observations. We argue that the Galactic $Fermi$ unidentified sources located at high latitudes should be dominated by MSPs, whereas the sources in the galactic plane are dominated by radio-quiet canonical pulsars.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-02-16T08:22:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gamma-ray pulsars",
      "population study",
      "ray msps",
      "sensitivity",
      "ray-selected pulsars"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 30,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 889531,
      "adsabs": "2011arXiv1102.2746T"
    }
  }
}