{
  "id": "2206.03395",
  "version": "v1",
  "published": "2022-06-07T15:42:55.000Z",
  "updated": "2022-06-07T15:42:55.000Z",
  "title": "First characterization of a new High Mass X-ray Binary in LMC eRASSU J050810.4$-$660653 with SRG/ART-XC, NuSTAR and Swift",
  "authors": [
    "Alexander Salganik",
    "Sergey S. Tsygankov",
    "Alexander A. Lutovinov",
    "Alexander A. Mushtukov",
    "Ilya A. Mereminskiy",
    "Sergey V. Molkov",
    "Andrei N. Semena"
  ],
  "comment": "Accepted for publication in MNRAS. 8 pages, 6 figures, 2 tables",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report results of the first detailed spectral and temporal studies of the recently discovered Be/X-ray binary eRASSU J050810.4$-$660653 in LMC based on the data from the SRG/ART-XC, NuSTAR and Swift/XRT instruments obtained in December 2021 - May 2022 in a wide energy range of 0.5-79 keV. Pulsations with the period of $40.5781 \\pm 0.0004$ s were found in the source light curve with the pulsed fraction monotonically increasing with the energy. An estimate of the orbital period of $\\sim38$ days was obtained based on the long-term monitoring of the system. The source spectrum can be well approximated with a power-law model modified by an exponential cutoff at high energies. The pulse phase-resolved spectroscopy shows a strong variation of spectral parameters depending on the phase of a neutron star rotation. We have not found any features connected with the cyclotron absorption line both in the phase-averaged and phase-resolved spectra of eRASSU J050810.4$-$660653. However, the neutron star magnetic field was estimated around several $10^{13}$ G using different indirect methods. Discovered variations of the hardness ratio over the pulse phase is discussed in terms of physical and geometrical properties of the emitting region.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-06-07T15:42:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high mass x-ray binary",
      "lmc erassu j050810",
      "first characterization",
      "srg/art-xc",
      "be/x-ray binary erassu j050810"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}