{
  "id": "2403.15305",
  "version": "v1",
  "published": "2024-03-22T15:55:50.000Z",
  "updated": "2024-03-22T15:55:50.000Z",
  "title": "X-ray emission spectrum for axion-photon conversion in magnetospheres of strongly magnetized neutron stars",
  "authors": [
    "Shubham Yadav",
    "M. Mishra",
    "Tapomoy Guha Sarkar"
  ],
  "comment": "13 pages, 14 figures",
  "categories": [
    "astro-ph.HE",
    "hep-ph"
  ],
  "abstract": "Detecting axionic dark matter (DM) could be possible in an X-ray spectrum from strongly magnetized neutron stars (NSs). We examine the possibility of axion-photon conversion in the magnetospheres of strongly magnetized NSs. In the current work, we investigate how the modified Tolman Oppenheimer Volkoff (TOV) system of equations (in the presence of a magnetic field) affects the energy spectrum of axions and axions-converted photon flux. We have considered the distance-dependent magnetic field in the modified TOV equations. We employ three different equations of states (EoSs) to solve these equations. We obtain the axions emission rate by including the Cooper-pair-breaking formation process (PBF) and Bremsstrahlung process in the core of NSs using the NSCool code. We primarily focus on three NSs: PSR B0531+21, PSR J0538+2817, and one Magnificient seven (M7) star RXJ 1856.5-3754. We further investigate the impact of the magnetic field on the actual observables, such as axion`s energy spectrum and axion-photon flux. We also compare our calculated axion-photon flux from all available archival data from PN+MOS+Chandra. Our predicted axion-photon flux values as a function of axion`s energy closely follow the experimentally archival data, which allows us to put bounds on the axion`s mass for the three different EoS.13",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-03-22T15:55:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "strongly magnetized neutron stars",
      "x-ray emission spectrum",
      "axion-photon conversion",
      "magnetic field",
      "axion-photon flux"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}