{
  "abstract": "The deep potential wells of galaxy clusters provide some of the strongest constraints on the velocity-dependent ($p$-wave) annihilation of weakly interacting massive particle (WIMP) dark matter. Cross-correlating high-latitude Fermi-LAT 16.3-year data with the western Galactic hemisphere eROSITA map facilitates high-sensitivity tests. A blind composite matched-filter scan of the cross-correlated spectrum for the $χχ\\toγγ$, $γZ$, and $γh$ annihilation-line triad of a single WIMP $χ$ finds $m_χc^2\\simeq71.9$ and $67.5$ GeV triads, each with a local $Z$-score $\\sim3$ and a (henceforth global) $1.6σ$ (trial-corrected by pixel shuffles; $1.8$-$2.1σ$ in Monte Carlo and analytic estimates), insensitive to details of detrending, sky masks, and filters. Scanning for the line nonad of two cross-annihilating WIMPs finds $66.4$ and $71.9$ GeV masses (with a weak $69.2$ GeV cross-annihilation triad) at $2.3σ$. The leading $\\sim72$ GeV triad coincides with the mass implied by interpreting the recently reported $\\sim43.2$ GeV $γ$-ray line in three nearby clusters as its $γZ$ channel. At this externally fixed mass, the triad reaches $3.0σ$ alone, and $5.1σ$ when combined with the reported line ($3.9σ$ under alternative assumptions). The triad, absent from the ambient (X-ray-uncorrelated) spectrum, presents in different Galactic sectors, strengthens under cosmological (positive) but not negative redshift broadening $Δz$, and peaks at $Δz\\simeq 0.05$, consistent with expectations; its two non-$43$ GeV channels reach $2.3σ$ by themselves. Measured (not loss-corrected) intrinsic cross sections are a few $10^{-19}$ cm$^3$ s$^{-1}$ for WIMPs tracing the X-ray gas.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.17044",
  "author_total": 1,
  "authors": [
    {
      "name": "Uri Keshet"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a0p0nb18my19h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.17044",
  "fulltext_url": null,
  "id": "a0p0nb18my19h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.17044",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7164888797",
  "pdf_url": "https://arxiv.org/pdf/2606.17044",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a0p0nb18my19h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:37Z",
      "native_id": "2606.17044",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.17044"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Fermi-eROSITA cross-correlations suggest annihilation lines of $\\sim70$ GeV WIMPs",
  "title_text": "Fermi-eROSITA cross-correlations suggest annihilation lines of ∼70 GeV WIMPs",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:37Z",
  "url": "https://research.draconitic.com/paper/a0p0nb18my19h",
  "venue": "arXiv",
  "versions": []
}