{
  "id": "2404.02782",
  "version": "v1",
  "published": "2024-04-03T14:53:28.000Z",
  "updated": "2024-04-03T14:53:28.000Z",
  "title": "AstroSat View of the Neutron Star Low-mass X-Ray Binary GX 5-1",
  "authors": [
    "Shyam Prakash V P",
    "Vivek K. Agrawal"
  ],
  "comment": "11 pages, 5 figures, 4 tables",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We present the spectral and timing study of the bright NS-LMXB GX 5-1 using \\textit{\\textit{AstroSat}/LAXPC} and \\textit{SXT} observations conducted in the year 2018. During the observation, the source traces out the complete HB and NB of the Z-track in the HID. Understanding the spectral and temporal evolution of the source along the 'Z' track can probe the accretion process in the vicinity of a neutron star. Spectral analysis was performed in the 0.7-20 keV energy range for different segments in the HID using a multi-temperature disc black body with an average temperature, $kT_{in} \\sim$0.46 and a thermal Comptonization model. It is found that the optical depth of the corona drops from $\\sim$6.68 in HB to $\\sim$2.74 in NB. The Timing analysis using the LAXPC instrument indicates the presence of quasi-periodic oscillations in HB, NB, and the hard apex of the Z-track. The observed QPO frequencies are similar to the characteristic frequencies of horizontal branch and normal branch oscillations. The HBO frequency increase from $\\sim$12-46 Hz towards the hard apex. The timing studies conducted in soft and hard band indicate the association of HBO and NBO origin with the non-thermal component. Further research could explore the implications of this relationship for understanding the dynamics of accretion onto neutron stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-04-03T14:53:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "neutron star low-mass x-ray binary",
      "star low-mass x-ray binary gx",
      "astrosat view",
      "hard apex",
      "multi-temperature disc black body"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}