{
  "id": "2301.13711",
  "version": "v1",
  "published": "2023-01-31T15:43:15.000Z",
  "updated": "2023-01-31T15:43:15.000Z",
  "title": "Wideband Study of the Brightest Black Hole X-ray Binary 4U 1543-47 in the 2021 Outburst: Signature of Disk-Wind Regulated Accretion",
  "authors": [
    "Geethu Prabhakar",
    "Samir Mandal",
    "Bhuvana G. R.",
    "Anuj Nandi"
  ],
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "A comprehensive wideband spectral analysis of the brightest black hole X-ray binary 4U $1543-47$ during its 2021 outburst is carried out for the first time using NICER, NuSTAR, and AstroSat observations by phenomenological and reflection modelling. The source attains a super-Eddington peak luminosity and remains in the soft state, with a small fraction ($< 3\\%$) of the inverse-Comptonized photons. The spectral modelling reveals a steep photon index ($\\Gamma \\sim 2-2.6$) and relatively high inner disk temperature ($T_{in}\\sim 0.9-1.27$ keV). The line-of-sight column density varies between ($0.45-0.54$)$\\times10^{22}$ cm$^{-2}$. Reflection modelling using the RELXILL model suggests that 4U $1543-47$ is a low-inclination system ($\\theta \\sim 32^\\circ - 40^\\circ$). The accretion disk is highly ionized (log $\\xi$ > 3) and has super solar abundance (3.6$-$10 $A_{Fe,\\odot}$) over the entire period of study. We detected a prominent dynamic absorption feature between $\\sim 8-11$ keV in the spectra throughout the outburst. This detection is the first of its kind for X-ray binaries. We infer that the absorption of the primary X-ray photons by the highly ionized, fast-moving disk-winds can produce the observed absorption feature. The phenomenological spectral modelling also shows the presence of a neutral absorption feature $\\sim 7.1 - 7.4$ keV, and both ionized and neutral absorption components follow each other with a delay of a typical viscous timescale of $10-15$ days.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-01-31T15:43:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "black hole x-ray binary 4u",
      "brightest black hole x-ray binary",
      "disk-wind regulated accretion",
      "high inner disk temperature",
      "wideband study"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}