{
  "abstract": "Dust masses and grain properties in $z>10$ galaxies remain poorly constrained, as JWST UV attenuation and ALMA dust re-emission are rarely modelled consistently. We perform post-processed 3D dust radiative transfer on 208 snapshots of 99 galaxies at $z=10$-15 from the FirstLight simulations ($M_*=10^{6.5}$-$10^{9.5}\\,M_\\odot$), applying twelve dust models per snapshot (2496 runs): four dust-to-metal (DTM) prescriptions and three grain size distributions. Metallicity-dependent DTM models reproduce ALMA dust-mass upper limits at $z\\gtrsim10$ and detections at $z\\sim7$, as dust-to-stellar mass ratios rise sharply near $Z\\sim0.2\\,Z_\\odot$, typically at $M_*\\gtrsim10^{8.5}\\,M_\\odot$, where grain growth by metal accretion becomes dominant. A constant DTM of 0.4 instead violates more than half of the upper limits. For dust attenuation, SMC-like dust is favored by the observed $M_{\\rm UV}$-$β_{\\rm UV}$ relation. The observed UV slopes ($β_{\\rm UV}\\simeq-2.3$) favor small grains ($a\\lesssimλ_{\\rm UV}/2π\\simeq0.025\\,μ{\\rm m}$) producing steep UV extinction, together with a low abundance of carbonaceous grains or PAHs responsible for the 2175 $\\mathrm{\\mathring{A}}$ bump, consistent with silicate-rich dust. Large-grain stellar dust ($a_0=0.1\\,μ{\\rm m}$) instead yields nearly grey extinction and UV slopes close to the intrinsic value ($β_{\\rm UV,0}\\simeq-2.6$). SMC and MW attenuation curves flatten at $A_{\\rm V}\\gtrsim0.3$, showing that relatively flat attenuation does not necessarily imply large grains. For dust re-emission, dust peak temperatures reach 60-80 K, exceeding the 40-50 K commonly assumed in ALMA dust-mass estimates. Predicted IR continuum flux increases with UV luminosity; at current ALMA sensitivities (10-20 $μ$Jy), detections generally require $M_{\\rm UV}\\lesssim-21.5$. Roman wide-field surveys may identify such rare UV-bright galaxies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22766",
  "author_total": 6,
  "authors": [
    {
      "name": "Yurina Nakazato"
    },
    {
      "name": "Akio K. Inoue"
    },
    {
      "name": "Rachel S. Somerville"
    },
    {
      "name": "Daisuke Toyouchi"
    },
    {
      "name": "Kosei Matsumoto"
    },
    {
      "name": "Daniel Ceverino"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/909cyhs8dtknz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22766",
  "fulltext_url": null,
  "id": "909cyhs8dtknz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22766",
  "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",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7222945606",
  "pdf_url": "https://arxiv.org/pdf/2610.22766",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/909cyhs8dtknz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.22766",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22766"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Dust in Galaxies at $z=10-15$: Attenuation and Re-emission Predictions from the FirstLight Simulations",
  "title_text": "Dust in Galaxies at z=10−15: Attenuation and Re-emission Predictions from the FirstLight Simulations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/909cyhs8dtknz",
  "venue": "arXiv",
  "versions": []
}