{
  "abstract": "We present a resolved far-infrared/sub-millimetre study of dust in the nearby spiral galaxy M 81 using Herschel PACS/SPIRE and JCMT SCUBA-2 observations from 70 to 850 μm. 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 κ350μm = 1.92 cm2 g−1, SMBB gives an integrated dust mass of (1.77 ± 0.09) × 107M⊙, while PPMAP gives (2.65 ± 0.13) × 107M⊙. 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 H i data, we find a positive radial gas-to-dust ratio gradient, with dlog10(GDR)/dR = 0.065 dex kpc−1. Comparison with M 81’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, ~0.27 M⊙ yr−1, and is strongly concentrated along the spiral arms. These results suggest that the dust, gas, and star-forming structures of M 81 are strongly shaped by its spiral arms, while the central region hosts the warmest dust in the disc.",
  "abstract_shown": true,
  "affiliations": [
    "Cardiff Hub for Astrophysics Research, and Technology, School of Physics & Astronomy , Cardiff University, Queens Buildings, Cardiff CF24 3AA ,",
    "Yonsei University Department of Astronomy, , 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722 ,",
    "Korea Astronomy and Space Science Institute , 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055 ,",
    "Blackett Lab, Imperial College London , Prince Consort Road, London SW7 2AZ ,",
    "Universiteit Gent Department of Physics and Astronomy, , Proeftuinstraat 86 N3, B-9000 Ghent ,",
    "Global Banking School, Universal Square , Devonshire Street North, Manchester, M12 6JH ,",
    "Armagh Observatory and Planetarium , College Hill. Armagh, BT61 9DB ,",
    "Tamkang University , 151 Yingzhuan Rd., Tamsui Dist., New Taipei City 251301, Taiwan ,",
    "Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871 ,",
    "School of Physics Department of Astronomy, , Peking University, Beijing 100871 ,",
    "Institut de Ciéncies de l’Espai (ICE, CSIC) , Can Magrans, s/n, E-08193 Cerdanyola del Vallés, Barcelona ,",
    "ICREA , Pg. Lluís Companys 23, E-08010 Barcelona ,",
    "Institut d’Estudis Espacials de Catalunya (IEEC) , E-08860 Castelldefels, Barcelona ,",
    "University College London Department of Physics and Astronomy, , Gower Street, London WC1E 6BT ,",
    "Granada Dept. Física Teórica y del Cosmos, E-18071 ,",
    "Instituto Universitario Carlos I de Física Teórica y Computacional , Universidad de Granada, 18071, Granada ,",
    "University College London Department of Physics & Astronomy, , London, WC1E 6BT ,",
    "Max Planck Institute for Radio Astronomy , Auf dem Hügel 69, 53121 Bonn ,",
    "Xinjiang Astronomical Observatory, Chinese Academy of Sciences , Urumqi 830011 ,",
    "Université Paris-Saclay, Université Paris Cité , CEA, CNRS, AIM, 91191, Gif-sur-Yvette ,",
    "Xiamen University Department of Astronomy, , Xiamen, Fujian 361005 ,",
    "The University of Manchester UK ALMA Regional Centre Node, Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, , Oxford Road, Manchester M13 9PL ,",
    "McMaster University Department of Physics & Astronomy, , 1280 Main Street W, Hamilton, ON, L8S 4M1 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 19,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "M Uzuner",
      "orcid": "0000-0002-4387-7684"
    },
    {
      "affs": [
        0
      ],
      "name": "M W L Smith",
      "orcid": "0000-0002-3532-6970"
    },
    {
      "affs": [
        0
      ],
      "name": "S Eales"
    },
    {
      "affs": [
        1
      ],
      "name": "A Chung",
      "orcid": "0000-0003-1440-8552"
    },
    {
      "affs": [
        2
      ],
      "name": "E J Chung"
    },
    {
      "affs": [
        3
      ],
      "name": "D L Clements",
      "orcid": "0000-0002-9548-5033"
    },
    {
      "affs": [
        4
      ],
      "name": "I De Looze",
      "orcid": "0000-0001-9419-6355"
    },
    {
      "affs": [
        5,
        6
      ],
      "name": "D J Eden",
      "orcid": "0000-0002-5881-3229"
    },
    {
      "affs": [
        7
      ],
      "name": "L Fanciullo",
      "orcid": "0000-0001-9930-9240"
    },
    {
      "affs": [
        8,
        9
      ],
      "name": "L C Ho"
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    {
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        10,
        11,
        12
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      "name": "F Kemper"
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    {
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        13
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      "name": "K Pattle",
      "orcid": "0000-0002-8557-3582"
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    {
      "affs": [
        14,
        15
      ],
      "name": "M Relaño"
    },
    {
      "affs": [
        16,
        17
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      "name": "A Saintonge",
      "orcid": "0000-0003-4357-3450"
    },
    {
      "affs": [
        18
      ],
      "name": "X Tang"
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    {
      "affs": [
        19
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      "name": "S A Van Der Giessen"
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    {
      "affs": [
        20
      ],
      "name": "J Wang"
    },
    {
      "affs": [
        21
      ],
      "name": "T G Williams",
      "orcid": "0000-0002-0012-2142"
    },
    {
      "affs": [
        22
      ],
      "name": "C D Wilson"
    }
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  "bibtex": "https://research.draconitic.com/paper/3fw6487jpcc9z.bib",
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  "doi": "10.1093/mnras/stag2127",
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  "issns": [
    "0035-8711",
    "1365-2966"
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  "pmcid": null,
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  "published": "2026-11-06",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/3fw6487jpcc9z.ris",
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    {
      "first_seen": "2026-11-07T00:21:00Z",
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    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
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  ],
  "title": "DOWSING, Dust Observations With SCUBA-2 In Nearby Galaxies: I. Dust in M 81",
  "title_text": "DOWSING, Dust Observations With SCUBA-2 In Nearby Galaxies: I. Dust in M 81",
  "type": "peer-reviewed",
  "updated_at": "2026-11-07T00:21:00Z",
  "url": "https://research.draconitic.com/paper/3fw6487jpcc9z",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}