{
  "abstract": "We investigate the multiphase circumgalactic medium (CGM) during the Epoch of Reionization (EoR, $z>6$) by cross-correlating cool- CII and warm-ionized CIV absorption systems with star-forming [OIII] emitters. JWST/NIRCam wide-field slitless spectroscopy from the EIGER survey is combined with medium- and high-resolution optical/NIR spectra of six background quasars, including new VLT/X-Shooter observations of PSO J159-02. We analyze the relation between 16 CII and 14 CIV absorbers ($\\log(N) > 13.0$) and 136 galaxies, within an impact parameter of R$_{\\perp} \\leq$ 1000 pkpc and a line-of-sight separation of $Δv \\leq 500$ km/s. We detect a statistically significant excess of both ions around galaxies compared to a randomized background. We observe that the CIV covering fraction remains enhanced up to $\\sim 1$ pMpc, whereas CII drops to the background level beyond $\\sim 0.5$ pMpc, demonstrating that the warm-ionized phase is more spatially extended than cooler gas. Jointly, the 3D galaxy-absorber spatial clustering is significantly weaker than the galaxy-galaxy auto-correlation. This provides direct physical evidence that early carbon enrichment is not confined to the virial radius of massive star-forming systems; rather, a substantial fraction of these metals permeates the diffuse intergalactic medium (IGM) or is injected by a widespread population of faint, undetected dwarf galaxies. Finally, we note a rapid radial decline of the CIV covering fraction compared with lower redshift samples at $z<2$ and $z\\sim3-4$ pointing out an evolving CGM ionization structure where early metals reside predominantly in lower ionization states. In conclusion, we determine a conservative lower limit for the observed carbon mass of $\\rm M_{CII + CIV} \\geq 2.8 \\times 10^6 \\, M_{\\odot}$ within 300 pkpc.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15547",
  "author_total": 20,
  "authors": [
    {
      "name": "C. Piscitelli"
    },
    {
      "name": "V. D'Odorico"
    },
    {
      "name": "M. Galbiati"
    },
    {
      "name": "M. Bischetti"
    },
    {
      "name": "G. Cupani"
    },
    {
      "name": "R. Dutta"
    },
    {
      "name": "S. Cantalupo"
    },
    {
      "name": "S. Di Stefano"
    },
    {
      "name": "S. T. Guida"
    },
    {
      "name": "K. Knudsen"
    },
    {
      "name": "C. Mazzucchelli"
    },
    {
      "name": "L. Paquereau"
    },
    {
      "name": "L. Pentericci"
    },
    {
      "name": "R. Rana"
    },
    {
      "name": "F. Ricci"
    },
    {
      "name": "F. Salvestrini"
    },
    {
      "name": "A. Tortosa"
    },
    {
      "name": "A. Travascio"
    },
    {
      "name": "C. Vignali"
    },
    {
      "name": "L. Zappacosta"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dz6tek02sq1zf.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15547",
  "fulltext_url": null,
  "id": "dz6tek02sq1zf",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15547",
  "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"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7213249875",
  "pdf_url": "https://arxiv.org/pdf/2609.15547",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dz6tek02sq1zf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.15547",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15547"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "The Multiphase CGM in the Epoch of Reionization: CII and CIV absorbers around [OIII] Emitters",
  "title_text": "The Multiphase CGM in the Epoch of Reionization: CII and CIV absorbers around [OIII] Emitters",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/dz6tek02sq1zf",
  "venue": "arXiv",
  "versions": []
}