{
  "abstract": "Outflows driven by feedback leave imprints on a galaxy's diffuse X-ray emission. Elemental abundances provide key diagnostics of feedback-driven chemical enrichment. We present a spectroscopic study of the diffuse X-ray emission in NGC 3079 using XMM-Newton RGS and EPIC, focusing on the nuclear region and the extended galactic-scale superbubble (GSB). We analyzed the high-resolution RGS spectrum of the central $\\sim4~\\rm kpc$ region, encompassing the $\\sim1~\\rm kpc$ nuclear superbubble (NSB), and the EPIC spectrum of the GSB out to $5'~(\\sim25~\\rm kpc)$. The nuclear spectrum is best described by a multi-temperature thermal-plasma model plus a charge-exchange (CX) component, which contributes approximately $13\\%$ of the total observed energy flux in the $0.2-2~\\rm keV$ band. The best-fit O/Fe and Ne/Fe ratios are $0.47$ and $0.77$ in solar units. Comparing these ratios with IMF-weighted core-collapse supernova (SNcc) yields gives an upper progenitor-mass cutoff of $M_{\\rm u}\\simeq13-15~M_{\\odot}$ for pure SNcc enrichment. For the best-fit spectral model, including an SNIa contribution increases the inferred cutoff, but its $1σ$ upper limit remains below $25~M_\\odot$ for SNIa fractions up to $10\\%$ within the adopted yield models. The characteristic ages of the NSB and GSB are $0.92^{+0.39}_{-0.46}~\\rm Myr$ and $29.6^{+1.6}_{-2.9}~\\rm Myr$, respectively, suggesting episodic feedback in NGC 3079.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.37646",
  "author_total": 6,
  "authors": [
    {
      "name": "Jiejia Liu"
    },
    {
      "name": "Junjie Mao"
    },
    {
      "name": "Shuinai Zhang"
    },
    {
      "name": "Guan-Fu Liu"
    },
    {
      "name": "Rui Huang"
    },
    {
      "name": "Wei Cui"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ajawpd9e3xskb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.37646",
  "fulltext_url": null,
  "id": "ajawpd9e3xskb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.37646",
  "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"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7214935207",
  "pdf_url": "https://arxiv.org/pdf/2609.37646",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ajawpd9e3xskb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.37646",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.37646"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "X-ray measurements of the elemental abundances for the diffuse emission in the nuclear starburst galaxy NGC 3079",
  "title_text": "X-ray measurements of the elemental abundances for the diffuse emission in the nuclear starburst galaxy NGC 3079",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/ajawpd9e3xskb",
  "venue": "arXiv",
  "versions": []
}