DOWSING, Dust Observations With SCUBA-2 In Nearby Galaxies: I. Dust in M 81

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ID: 339154
2026
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Abstract
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.
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Authors Mete Uzuner, M. Smith, S. A. Eales, Aeree Chung, E J Chung, David L. Clements, Ilse De Looze, David J. Eden, Lapo Fanciullo, L C Ho, Francisca Kemper, Kate M Pattle, M Relaño, A. Saintonge, X Tang, S A Van Der Giessen, J Wang, Thomas G. Williams, C D Wilson
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag2127
URL
https://doi.org/10.1093/mnras/stag2127
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