{
  "abstract": "Diffuse X-ray emission in galaxies originates from stellar-feedback-heated gas and unresolved compact sources. We investigate its thermal component and the scaling of X-ray luminosity with star formation rate (SFR), including galaxies with very low SFRs. We analyzed eROSITA/SRG data from the four all-sky surveys (eRASS:4) for a blind, volume-limited sample of 140 galaxies within 25 Mpc from the Updated Nearby Galaxy Catalog (Karachentsev et al. 2013), cross-matched with HECATEv2 (Kyritsis et al. 2026b). Early-type galaxies were analyzed separately, while star-forming galaxies were divided into low-, medium-, and high-specific-SFR (sSFR) subsamples. We modeled the integrated X-ray spectra with thermal plasma and power-law components, stacked spectra for each subsample, and derived total and thermal X-ray luminosities. The stacked spectra show a stronger soft thermal component at high sSFR, whereas low-sSFR and early-type galaxies are increasingly dominated by the harder non-thermal continuum. For star-forming galaxies, the total 0.5-8 keV luminosity follows $\\log L_X \\sim 39.5 + 0.9\\log\\mathrm{SFR}$, with an intrinsic scatter of about 0.9 dex. The 0.5-2 keV thermal luminosity follows $\\log L_X \\sim 38.7 + 1.1\\log\\mathrm{SFR}$, with an intrinsic scatter of about 0.7 dex. The thermal luminosity remains well correlated with SFR down to $\\sim 10^{-5}\\,\\mathrm{M}_\\odot\\,\\mathrm{yr}^{-1}$ and is consistent with previous relations for star-forming galaxies. By contrast, the flatter and more scattered total X-ray luminosity-SFR relation suggests that unresolved X-ray binaries likely dominate at low SFR, while thermal X-ray emission remains a robust tracer of stellar feedback.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.16936",
  "author_total": 12,
  "authors": [
    {
      "name": "Roman Laktionov"
    },
    {
      "name": "Manami Sasaki"
    },
    {
      "name": "Elias Kyritsis"
    },
    {
      "name": "Andreas Zezas"
    },
    {
      "name": "Steven Hämmerich"
    },
    {
      "name": "Fiona Knies"
    },
    {
      "name": "Jörn Wilms"
    },
    {
      "name": "Frank Haberl"
    },
    {
      "name": "Martin G. H. Krause"
    },
    {
      "name": "Ashley Coombs"
    },
    {
      "name": "Philipp Weber"
    },
    {
      "name": "Aafia Zainab"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dsdedv6wync56.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.16936",
  "fulltext_url": null,
  "id": "dsdedv6wync56",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.16936",
  "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.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.16936",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dsdedv6wync56.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.16936",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.16936"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Unveiling the Hot Interstellar Medium in Nearby Galaxies with eROSITA",
  "title_text": "Unveiling the Hot Interstellar Medium in Nearby Galaxies with eROSITA",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/dsdedv6wync56",
  "venue": "arXiv",
  "versions": []
}