{
  "id": "2102.04026",
  "version": "v1",
  "published": "2021-02-08T06:49:04.000Z",
  "updated": "2021-02-08T06:49:04.000Z",
  "title": "Discovery and timing of three millisecond pulsars in radio and gamma-rays with the GMRT and Fermi-LAT",
  "authors": [
    "B. Bhattacharyya",
    "J. Roy",
    "T. J. Johnson",
    "P. S. Ray",
    "P. C. C. Freire",
    "Y. Gupta",
    "D. Bhattacharya",
    "A. Kaninghat",
    "B. W. Stappers",
    "E. C. Ferrara",
    "S. Sengupta",
    "R. S. Rathour",
    "M. Kerr",
    "D. A. Smith",
    "P. M. Saz Parkinson",
    "S. M. Ransom",
    "P. F. Michelson"
  ],
  "comment": "35 pages, 8 Figures, 4 Tables, Accepted for publication in the Astrophysical Journal",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We performed deep observations to search for radio pulsations in the directions of 375 unassociated Fermi Large Area Telescope (LAT) gamma-ray sources using the Giant Metrewave Radio Telescope (GMRT) at 322 and 607 MHz. In this paper we report the discovery of three millisecond pulsars (MSPs), PSR J0248+4230, PSR J1207$-$5050 and PSR J1536$-$4948. We conducted follow up timing observations for around 5 years with the GMRT and derived phase coherent timing models for these MSPs. PSR J0248$+$4230 and J1207$-$5050 are isolated MSPs having periodicities of 2.60 ms and 4.84 ms. PSR J1536-4948 is a 3.07 ms pulsar in a binary system with orbital period of around 62 days about a companion of minimum mass 0.32 solar mass. We also present multi-frequency pulse profiles of these MSPs from the GMRT observations. PSR J1536-4948 is an MSP with an extremely wide pulse profile having multiple components. Using the radio timing ephemeris we subsequently detected gamma-ray pulsations from these three MSPs, confirming them as the sources powering the gamma-ray emission. For PSR J1536-4948 we performed combined radio-gamma-ray timing using around 11.6 years of gamma-ray pulse times of arrivals (TOAs) along with the radio TOAs. PSR J1536-4948 also shows evidence for pulsed gamma-ray emission out to above 25 GeV, confirming earlier associations of this MSP with a >10 GeV point source. The multi-wavelength pulse profiles of all three MSPs offer challenges to models of radio and gamma-ray emission in pulsar magnetospheres.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-02-08T06:49:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "millisecond pulsars",
      "phase coherent timing models",
      "gamma-ray emission",
      "giant metrewave radio telescope",
      "pulse profile"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 35,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}