{
  "id": "2312.16937",
  "version": "v1",
  "published": "2023-12-28T10:19:48.000Z",
  "updated": "2023-12-28T10:19:48.000Z",
  "title": "Timing and spectral analysis of the HMXB 4U 1700-37 observed with Insight-HXMT",
  "authors": [
    "Hua Xiao",
    "Long Ji",
    "Peng Zhang",
    "Lorenzo Ducci",
    "Victor Doroshenko",
    "Andrea Santangelo",
    "Shu Zhang",
    "Shuang-Nan Zhang"
  ],
  "comment": "Accepted for publication in ApJ",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report timing and spectral studies of the high mass X-ray binary 4U 1700-37 using Insight-HXMT observations carried out in 2020 during its out-of-eclipse state. We found significant variations in flux on a time-scale of kilo-seconds, while the hardness (count rate ratio between 10-30 keV and 2-10 keV) remains relatively stable. No evident pulsations were found over a frequency range of $10^{-3}$-2000 Hz. During the spectral analysis, for the first time we took the configuration of different Insight-HXMT detectors' orientations into account, which allows us obtaining reliable results even if a stable contamination exists in the field-of-view. We found that the spectrum could be well described by some phenomenological models that commonly used in accreting pulsars (e.g., a power law with a high energy cutoff) in the energy range of 2-100 keV. We found hints of cyclotron absorption features around ~ 16 keV or/and ~ 50 keV.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-12-28T10:19:48.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spectral analysis",
      "hmxb 4u",
      "insight-hxmt",
      "high mass x-ray binary 4u",
      "count rate ratio"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}