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Dust emissivity and absorption cross section in DustPedia late-type galaxies

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Abstract
Aims: We compare the far-infrared to sub-millimetre dust emission properties measured in high Galactic latitude cirrus with those determined in a sample of 204 late-type DustPedia galaxies. The aim is to verify if it is appropriate to use Milky Way dust properties to derive dust masses in external galaxies. Methods: We used Herschel observations and atomic and molecular gas masses to estimate ∊(250 μm), the disc-averaged dust emissivity at 250 μm, and from this, the absorption cross section per H atom σ(250 μm) and per dust mass κ(250 μm). The emissivity ∊(250 μm) requires one assumption, which is the CO-to-H2 conversion factor, and the dust temperature is additionally required for σ(250 μm); yet another constraint on the dust-to-hydrogen ratio D/H, depending on metallicity, is required for κ(250 μm). Results: We find ∊(250 μm) = 0.82 ± 0.07 MJy sr-1 (1020 H cm-2)-1 for galaxies with 4 < F(250 μm)/F(500 μm) < 5. This depends only weakly on the adopted CO-to-H2 conversion factor. The value is almost the same as that for the Milky Way at the same colour ratio. Instead, for F(250 μm)/F(500 μm) > 6, ∊(250 μm) is lower than predicted by its dependence on the heating conditions. The reduction suggests a variation in dust emission properties for spirals of earlier type, higher metallicity, and with a higher fraction of molecular gas. When the standard emission properties of Galactic cirrus are used for these galaxies, their dust masses might be underestimated by up to a factor of two. Values for σ(250 μm) and κ(250 μm) at the Milky Way metallicity are also close to those of the cirrus. Mild trends of the absorption cross sections with metallicity are found, although the results depend on the assumptions made.
Keywords
dust, extinction, infrared: galaxies, galaxies: photometry, galaxies: ISM, INTERSTELLAR DUST, SPECTRAL OBSERVATIONS, INFRARED-EMISSION, ABUNDANCE, METALLICITY, MASS, COEFFICIENT, DEPLETIONS, EXTINCTION, KAPPA(D)

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MLA
Bianchi, S., et al. “Dust Emissivity and Absorption Cross Section in DustPedia Late-Type Galaxies.” ASTRONOMY & ASTROPHYSICS, vol. 631, 2019, doi:10.1051/0004-6361/201936314.
APA
Bianchi, S., Casasola, V., Baes, M., Clark, C., Corbelli, E., Davies, J., … Ysard, N. (2019). Dust emissivity and absorption cross section in DustPedia late-type galaxies. ASTRONOMY & ASTROPHYSICS, 631. https://doi.org/10.1051/0004-6361/201936314
Chicago author-date
Bianchi, S, V Casasola, Maarten Baes, CJR Clark, E Corbelli, JI Davies, Ilse De Looze, et al. 2019. “Dust Emissivity and Absorption Cross Section in DustPedia Late-Type Galaxies.” ASTRONOMY & ASTROPHYSICS 631. https://doi.org/10.1051/0004-6361/201936314.
Chicago author-date (all authors)
Bianchi, S, V Casasola, Maarten Baes, CJR Clark, E Corbelli, JI Davies, Ilse De Looze, P De Vis, Wouter Dobbels, M Galametz, F Galliano, AP Jones, SC Madden, L Magrini, A Mosenkov, Angelos Nersesian, Sébastien Viaene, EM Xilouris, and N Ysard. 2019. “Dust Emissivity and Absorption Cross Section in DustPedia Late-Type Galaxies.” ASTRONOMY & ASTROPHYSICS 631. doi:10.1051/0004-6361/201936314.
Vancouver
1.
Bianchi S, Casasola V, Baes M, Clark C, Corbelli E, Davies J, et al. Dust emissivity and absorption cross section in DustPedia late-type galaxies. ASTRONOMY & ASTROPHYSICS. 2019;631.
IEEE
[1]
S. Bianchi et al., “Dust emissivity and absorption cross section in DustPedia late-type galaxies,” ASTRONOMY & ASTROPHYSICS, vol. 631, 2019.
@article{8641166,
  abstract     = {{Aims: We compare the far-infrared to sub-millimetre dust emission properties measured in high Galactic latitude cirrus with those determined in a sample of 204 late-type DustPedia galaxies. The aim is to verify if it is appropriate to use Milky Way dust properties to derive dust masses in external galaxies. 
Methods: We used Herschel observations and atomic and molecular gas masses to estimate ∊(250 μm), the disc-averaged dust emissivity at 250 μm, and from this, the absorption cross section per H atom σ(250 μm) and per dust mass κ(250 μm). The emissivity ∊(250 μm) requires one assumption, which is the CO-to-H2 conversion factor, and the dust temperature is additionally required for σ(250 μm); yet another constraint on the dust-to-hydrogen ratio D/H, depending on metallicity, is required for κ(250 μm). 
Results: We find ∊(250 μm) = 0.82 ± 0.07 MJy sr-1 (1020 H cm-2)-1 for galaxies with 4 < F(250 μm)/F(500 μm) < 5. This depends only weakly on the adopted CO-to-H2 conversion factor. The value is almost the same as that for the Milky Way at the same colour ratio. Instead, for F(250 μm)/F(500 μm) > 6, ∊(250 μm) is lower than predicted by its dependence on the heating conditions. The reduction suggests a variation in dust emission properties for spirals of earlier type, higher metallicity, and with a higher fraction of molecular gas. When the standard emission properties of Galactic cirrus are used for these galaxies, their dust masses might be underestimated by up to a factor of two. Values for σ(250 μm) and κ(250 μm) at the Milky Way metallicity are also close to those of the cirrus. Mild trends of the absorption cross sections with metallicity are found, although the results depend on the assumptions made.}},
  articleno    = {{A102}},
  author       = {{Bianchi, S and Casasola, V and Baes, Maarten and Clark, CJR and Corbelli, E and Davies, JI and De Looze, Ilse and De Vis, P and Dobbels, Wouter and Galametz, M and Galliano, F and Jones, AP and Madden, SC and Magrini, L and Mosenkov, A and Nersesian, Angelos and Viaene, Sébastien and Xilouris, EM and Ysard, N}},
  issn         = {{1432-0746}},
  journal      = {{ASTRONOMY & ASTROPHYSICS}},
  keywords     = {{dust,extinction,infrared: galaxies,galaxies: photometry,galaxies: ISM,INTERSTELLAR DUST,SPECTRAL OBSERVATIONS,INFRARED-EMISSION,ABUNDANCE,METALLICITY,MASS,COEFFICIENT,DEPLETIONS,EXTINCTION,KAPPA(D)}},
  language     = {{eng}},
  pages        = {{12}},
  title        = {{Dust emissivity and absorption cross section in DustPedia late-type galaxies}},
  url          = {{http://doi.org/10.1051/0004-6361/201936314}},
  volume       = {{631}},
  year         = {{2019}},
}

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