{
  "abstract": "Dusty star-forming galaxies (DSFGs) are expected to trace early massive-halo assembly, but the connection between dust-obscured star formation, morphology, hot dust, and environment remains unclear at $z$>4. We combine JWST/NIRCam F444W grism spectroscopy from COSMOS-3D with MIRI F1000W/F2100W imaging and a mixed ALMA-selected and ALMA-followed dusty-galaxy sample from CRISTAL, CHAMPS, REBELS, and A3COSMOS to study 18 DSFGs or DSFG candidates at z=4.9-7.2. We compare their environments with the parent spectroscopically confirmed emission-line sample and the COSMOS-Web photo-z galaxy sample using separate and combined overdensity estimators. The parent narrow-line H$α$ sample has a median observed, dust-uncorrected ${\\rm SFR}_{\\rm Hα}=11.7 M_\\odot~{\\rm yr^{-1}}$. Within R=0.5 pMpc, DSFGs have a median $δ_{\\rm spec+phot}=0.92^{+0.06}_{-0.16}$, compared with $0.80^{+0.05}_{-0.04}$ for HAEs, with a stronger contrast on smaller scales. The strongest compact overdensities are associated with merger/interacting morphology: merging DSFGs reach $δ_{\\rm spec+phot}=4.70^{+1.61}_{-1.51}$ within R=0.5 pMpc. In contrast, MIRI-bright DSFGs do not show an enhanced number of nearby visible H$α$-emitting companions, and their F2100W fluxes are difficult to explain with the 3.3 $μ$m PAH feature alone, suggesting an additional hot-dust component. These results are consistent with a possible phase-dependent picture in which the compact line-emitter core, merger-driven dusty phase, and MIRI-bright hot-dust phase need not be spatially or temporally identical during early structure growth.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.35987",
  "author_total": 23,
  "authors": [
    {
      "name": "Siwei Zou"
    },
    {
      "name": "Manuel Aravena"
    },
    {
      "name": "Shaoze Geng"
    },
    {
      "name": "Romain A Meyer"
    },
    {
      "name": "Jianwei Lyu"
    },
    {
      "name": "Jaclyn B Champagne"
    },
    {
      "name": "Jia-Sheng Huang"
    },
    {
      "name": "Andreas L Faisst"
    },
    {
      "name": "Shuqi Fu"
    },
    {
      "name": "Andrew J Battisti"
    },
    {
      "name": "Hiddo Algera"
    },
    {
      "name": "Caitlin M Casey"
    },
    {
      "name": "Xiaohui Fan"
    },
    {
      "name": "Maximilien Franco"
    },
    {
      "name": "Ghassem Gozaliasl"
    },
    {
      "name": "Linhua Jiang"
    },
    {
      "name": "Koki Kakiichi"
    },
    {
      "name": "Darshan Kakkad"
    },
    {
      "name": "Zihao Li"
    },
    {
      "name": "Lun-Jun Liu"
    },
    {
      "name": "Felix Martinez"
    },
    {
      "name": "Jorge A Zavala"
    },
    {
      "name": "Rasha M Samir"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dq0472nkdtafe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.35987",
  "fulltext_url": null,
  "id": "dq0472nkdtafe",
  "issns": [],
  "landing_url": "https://hal.science/hal-05842245v1",
  "language": "en",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7214939311",
  "pdf_url": "https://arxiv.org/pdf/2609.35987",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dq0472nkdtafe.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:02Z",
      "native_id": "hal-05842245",
      "source": "hal",
      "url": "https://hal.science/hal-05842245v1"
    },
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.35987",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.35987"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "COSMOS-3D: Diverse Environments and Hot-dust Signatures among Dusty Star-forming Galaxies at $z$ = 4.9-7.2",
  "title_text": "COSMOS-3D: Diverse Environments and Hot-dust Signatures among Dusty Star-forming Galaxies at z = 4.9-7.2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/dq0472nkdtafe",
  "venue": "HAL",
  "versions": []
}