{
  "abstract": "We present a spectral and timing analysis of X-ray emission from the actively accreting supermassive black hole (SMBH) in RX~J1301.9+2747 with prominent quasi-periodic eruptions (QPEs) using {\\it ASCA, ROSAT, XMM-Newton}, and {\\it NICER} observations. {\\it NICER} detected renewed QPE activity from this source in 2024. We examined in detail the X-ray spectrum formation in this source during QPE outbursts applying the first-principal model, Bulk Motion Comptonization. We find an increase of the photon index $Γ$ with a mass accretion rate $\\dot M$, the index saturation at $Γ_{sat}=2.7\\pm 0.1$ at high $\\dot M$ value during outburst peaks. Based on the derived $Γ-\\dot M$ correlation, we apply the scaling technique for the first time to measure the black hole mass in RX~J1301.9+2747. The SMBH mass in this source was estimated to be between $4\\times 10^5$ M$_ {\\odot}$ and $7\\times 10^6$ M$_ {\\odot}$ for the inclination range from 0$^{\\circ}$ to 70$^{\\circ}$, which is adopted as a plausible range based on the AGN unified model assumption, applying HLX--1~ESO 243--49, OJ~287, and 1H~0707--495 as reference scaling sources. We also estimate a BH mass in RX~J1301.9+2747 applying a timing analysis, in which the Compton cloud size to be $\\sim 10^{11}$ cm, estimated from the quasi-periodic oscillation frequency, $ν\\sim 10^{-4}$ Hz, indicates SMBH mass in RX~J1301.9+2747 is of order of $10^6$ M$_{\\odot}$. Overall, the BH mass obtained by the scaling method in this source is consistent with previous measurements using other methods.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.08308",
  "author_total": 5,
  "authors": [
    {
      "name": "Lev Titarchuk"
    },
    {
      "name": "Elena Seifina"
    },
    {
      "name": "Vadim Arefiev"
    },
    {
      "name": "Diana Makhinya"
    },
    {
      "name": "Alexei Le"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6x4hf2qkgy294.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.08308",
  "fulltext_url": null,
  "id": "6x4hf2qkgy294",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.08308",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.08308",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6x4hf2qkgy294.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2610.08308",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.08308"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "X-ray spectral scaling of black hole mass in quasi-periodic eruptive source RX J1301.9+2747",
  "title_text": "X-ray spectral scaling of black hole mass in quasi-periodic eruptive source RX J1301.9+2747",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/6x4hf2qkgy294",
  "venue": "arXiv",
  "versions": []
}