{
  "id": "2304.07323",
  "version": "v1",
  "published": "2023-04-14T18:00:10.000Z",
  "updated": "2023-04-14T18:00:10.000Z",
  "title": "Strong and Rapid X-ray Variability of the Super-Eddington Accreting Quasar SDSS J081456.10+532533.5",
  "authors": [
    "Jian Huang",
    "Bin Luo",
    "W. N. Brandt",
    "Pu Du",
    "Gordon P. Garmire",
    "Chen Hu",
    "Hezhen Liu",
    "Qingling Ni",
    "Jian-Min Wang"
  ],
  "comment": "16 pages, 8 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "We report strong and rapid X-ray variability found from the super-Eddington accreting quasar SDSS J081456.10+532533.5 at $z=0.1197$. It has a black-hole mass of $2.7\\times10^{7}{M_{\\odot}}$ and a dimensionless accretion rate of $\\approx4$ measured from reverberation-mapping observations. It showed weak X-ray emission in the 2021 February Chandra observation, with the 2 keV flux density being $9.6^{+11.6}_{-4.6}$ times lower compared to an archival Swift observation. The 2 keV flux density is also $11.7^{+9.6}_{-6.3}$ times weaker compared to the expectation from its optical/UV emission. In a follow-up XMM-Newton observation 32 days later, the 2 keV flux density increased by a factor of $5.3^{+6.4}_{-2.4}$, and the spectra are best described by a power law modified with partial-covering absorption; the absorption-corrected intrinsic continuum is at a nominal flux level. Nearly simultaneous optical spectra reveal no variability, and there is only mild long-term optical/infrared variability from archival data (with a maximum variability amplitude of $\\approx50\\%$). We interpret the X-ray variability with an obscuration scenario, where the intrinsic X-ray continuum does not vary but the absorber has variable column density and covering factor along the line of sight. The absorber is likely the small-scale clumpy accretion wind that has been proposed to be responsible for similar X-ray variability in other super-Eddington accreting quasars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-04-14T18:00:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "super-eddington accreting quasar sdss",
      "rapid x-ray variability",
      "kev flux density",
      "small-scale clumpy accretion wind",
      "observation"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}