{
  "id": "1810.07115",
  "version": "v1",
  "published": "2018-10-16T16:14:41.000Z",
  "updated": "2018-10-16T16:14:41.000Z",
  "title": "Study of the reflection spectra of SAX J1748.9-2021",
  "authors": [
    "Rahul Sharma",
    "Chetana Jain",
    "Anjan Dutta"
  ],
  "comment": "6 pages, 6 figures. Accepted for publication in MNRAS",
  "doi": "10.1093/mnras/sty2808",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report the spectral analysis of accretion powered millisecond X-ray pulsar SAX J1748.9-2021 from the NuSTAR observation made during its 2015 outburst. The spectra displayed a broad emission line at $\\sim 6.5$ keV with line width of $\\sim 0.5$ keV and excess above $\\sim 20$ keV due to Compton hump. The persistent emission of SAX J1748.9-2021 is described by a combination of soft thermal component with $kT =0.62^{+0.03}_{-0.05}$ keV and thermally Comptonized component with $kT_e=2.50^{+0.06}_{-0.03}$ keV reflected from the disc with reflection fraction of $0.30^{+0.08}_{-0.04}$. We have modeled the reflection spectrum with self-consistent model relxillCP and have found the inclination of the accretion disc to be $32.3^{^\\circ +4.8}_{-4.7}$ and log $\\xi$ is equal to $3.05^{+0.40}_{-0.34}$. We have obtained an upper limit of 57 km for inner disc radius; and the estimated magnetic field strength at the poles is less than $3.4 \\times 10^9$ G. This kind of detailed investigation of reflection spectrum of SAX J1748.9-2021, especially above 10 keV, has been achieved only because of high statistics NuSTAR data of the source.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-16T16:14:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "reflection spectrum",
      "millisecond x-ray pulsar sax j1748",
      "powered millisecond x-ray pulsar sax",
      "accretion powered millisecond x-ray pulsar",
      "high statistics nustar data"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}