{
  "abstract": "Short-timescale X-ray variability provides a direct probe of unstable accretion onto compact objects, yet extragalactic X-ray binaries (XRBs) with recurrent flaring remain largely unexplored. Here we present a detailed X-ray study of M81F4 (2CXO~J095524.2+690957), a persistently luminous X-ray source towards M81 that exhibits recurrent short X-ray flares. Based on multi-mission X-ray observations spanning two decades, it is found that M81F4 remains persistently bright at $L_{0.5-8.0\\rm~keV}\\sim10^{38}-10^{39}\\rm~erg~s^{-1}$, while producing flares lasting a few hundred seconds and reaching peak luminosities of a few $10^{39}\\rm~erg~s^{-1}$, with an observed mean (minimum) recurrence time of $\\sim0.5$ day ($\\sim$6 ks). The stacked flare profile shows a rapid rise followed by a slower decay, but no significant hardness evolution. Spectral analysis reveals that both the flare and non-flare states are dominated by a hard power-law continuum, with marginal evidence of highly ionized Fe lines in the non-flare state spectrum. These properties disfavor classical Type I and Type II bursts and have no close analog among known XRBs. We favor a magnetized neutron star accreting from an intermediate mass donor at a persistently high rate with the flares arising from instabilities at the disk-magnetosphere boundary. If confirmed, M81F4 might represent a hidden population of XRBs in which sustained, magnetically-regulated accretion can lead to brief episodes of super-Eddington emission.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.23339",
  "author_total": 6,
  "authors": [
    {
      "name": "Jiachang Zhang"
    },
    {
      "name": "Zhiyuan Li"
    },
    {
      "name": "Xiangdong Li"
    },
    {
      "name": "Tong Bao"
    },
    {
      "name": "Ziqian Hua"
    },
    {
      "name": "ShanShan Weng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dbzp6377ys4t8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.23339",
  "fulltext_url": null,
  "id": "dbzp6377ys4t8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.23339",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7222956524",
  "pdf_url": "https://arxiv.org/pdf/2610.23339",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dbzp6377ys4t8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.23339",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.23339"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "The Dancing Bonfire: An Unusual Persistent X-ray Source in M81 Exhibiting Recurrent Luminous Flares",
  "title_text": "The Dancing Bonfire: An Unusual Persistent X-ray Source in M81 Exhibiting Recurrent Luminous Flares",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/dbzp6377ys4t8",
  "venue": "arXiv",
  "versions": []
}