{
  "abstract": "We present a resolved far-infrared/sub-millimetre study of dust in the nearby spiral galaxy M81 using Herschel PACS/SPIRE and JCMT SCUBA-2 observations from 70 to $850\\,μ\\mathrm{m}$. We model the dust emission using both single-temperature modified blackbody (SMBB) fits and point process mapping (PPMAP), comparing pixel-by-pixel SED-fitting with image cubes of dust surface density as a function of position and temperature. For fixed $β= 1.9$ and a dust opacity of $κ_{350\\,μ\\mathrm{m}} = 1.92\\,\\mathrm{cm}^{2}\\,\\mathrm{g}^{-1}$, SMBB gives an integrated dust mass of $(1.77 \\pm 0.09) \\times 10^{7}\\,M_\\odot$, while PPMAP gives $(2.65 \\pm 0.13) \\times10^{7}\\,M_\\odot$. The higher PPMAP mass is expected because real lines of sight contain dust over a range of temperatures, whereas SMBB assumes a single effective temperature and can underestimate the dust mass. Both methods show enhanced dust surface densities along the spiral arms and a radially declining dust temperature, with the warmest dust in the central region. Variable-$β$ fits indicate only moderate spatial variation in $β$ for well-constrained pixels, but the strong $T$-$β$ degeneracy motivates a fixed emissivity index for the main analysis. Combining the dust maps with HI data, we find a positive radial gas-to-dust ratio gradient, with $d\\log_{10}(\\mathrm{GDR})/dR = 0.065\\,\\mathrm{dex}\\,\\mathrm{kpc}^{-1}$. Comparison with M81's metallicity gradient implies a declining dust-to-metals ratio, potentially consistent with more efficient grain growth in the inner disc. The star formation rate is modest, $\\sim 0.27\\,M_\\odot\\,{\\rm yr}^{-1}$, and is strongly concentrated along the spiral arms. These results suggest that the dust, gas, and star-forming structures of M81 are strongly shaped by its spiral arms, while the central region hosts the warmest dust in the disc.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.07044",
  "author_total": 19,
  "authors": [
    {
      "name": "M. Uzuner"
    },
    {
      "name": "M. W. L. Smith"
    },
    {
      "name": "S. Eales"
    },
    {
      "name": "A. Chung"
    },
    {
      "name": "E. J. Chung"
    },
    {
      "name": "D. L. Clements"
    },
    {
      "name": "I. De Looze"
    },
    {
      "name": "D. J. Eden"
    },
    {
      "name": "L. Fanciullo"
    },
    {
      "name": "L. C. Ho"
    },
    {
      "name": "F. Kemper"
    },
    {
      "name": "K. Pattle"
    },
    {
      "name": "M. Relaño"
    },
    {
      "name": "A. Saintonge"
    },
    {
      "name": "X. Tang"
    },
    {
      "name": "S. A. Van Der Giessen"
    },
    {
      "name": "J. Wang"
    },
    {
      "name": "T. G. Williams"
    },
    {
      "name": "C. D. Wilson"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dd1k1xw6pempe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.07044",
  "fulltext_url": null,
  "id": "dd1k1xw6pempe",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.07044",
  "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.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.07044",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dd1k1xw6pempe.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.07044",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.07044"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "DOWSING, Dust Observations With SCUBA-2 In Nearby Galaxies: I. Dust in M81",
  "title_text": "DOWSING, Dust Observations With SCUBA-2 In Nearby Galaxies: I. Dust in M81",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:40Z",
  "url": "https://research.draconitic.com/paper/dd1k1xw6pempe",
  "venue": "arXiv",
  "versions": []
}