{
  "id": "2112.02794",
  "version": "v2",
  "published": "2021-12-06T05:45:07.000Z",
  "updated": "2022-07-05T13:12:46.000Z",
  "title": "The Spin of New Black Hole Candidate: MAXI J1803-298 Observed by NuSTAR and NICER",
  "authors": [
    "Ye Feng",
    "Xueshan Zhao",
    "Yufeng Li",
    "Lijun Gou",
    "Nan Jia",
    "Zhenxuan Liao",
    "Yuan Wang"
  ],
  "comment": "6 pages, 5 figures",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "MAXI J1803-298, a newly-discovered Galactic transient and black hole candidate, was first detected by \\emph{MAXI}/GSC on May 1st, 2021. In this paper, we present a detailed spectral analysis of MAXI J1803-298. Utilizing the X-ray reflection fitting method, we perform a joint fit to the spectra of MAXI J1803-298, respectively, observed by \\emph{NuSTAR} and \\emph{NICER}/XTI on the same day over the energy range between 0.7-79.0 keV, and found its spin (and the inclination angle i) can be constrained to be close to an extreme value, 0.991 ($i\\sim$ $70 ^{\\circ}$), at 68\\% confidence interval. The results suggest that MAXI J1803-298 may be a fast-rotating black hole with a large inclination angle.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2022-07-05T13:12:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "black hole candidate",
      "large inclination angle",
      "x-ray reflection fitting method",
      "galactic transient",
      "fast-rotating black hole"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}