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

Autor: Laura Magrini, I. De Looze, J. I. Davies, Maarten Baes, Simone Bianchi, Anthony P. Jones, Sébastien Viaene, S. C. Madden, Viviana Casasola, P. De Vis, Emmanuel M. Xilouris, Edvige Corbelli, Maud Galametz, A. Nersesian, Christopher J. R. Clark, Frédéric Galliano, Wouter Dobbels, Aleksandr V. Mosenkov, Nathalie Ysard
Přispěvatelé: INAF - Osservatorio Astrofisico di Arcetri (OAA), Istituto Nazionale di Astrofisica (INAF), Sterrenkundig Observatorium, Universiteit Gent = Ghent University (UGENT), Space Telescope Science Institute (STSci), Cardiff University, University College of London [London] (UCL), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), The Central Astronomical Observatory of the Russian Academy of Sciences [Pulkovo], Russian Academy of Sciences [Moscow] (RAS), National Observatory of Athens (NOA), University of Hertfordshire [Hatfield] (UH), Universiteit Gent, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
010504 meteorology & atmospheric sciences
Metallicity
Milky Way
INFRARED-EMISSION
Extinction (astronomy)
DEPLETIONS
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
MASS
01 natural sciences
galaxies [infrared]
infrared: galaxies
0103 physical sciences
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Cosmic dust
Physics
Luminous infrared galaxy
ISM [galaxies]
extinction
SPECTRAL OBSERVATIONS
Absorption cross section
Astronomy and Astrophysics
KAPPA(D)
Astrophysics - Astrophysics of Galaxies
Galaxy
galaxies: photometry
Physics and Astronomy
13. Climate action
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
photometry [galaxies]
Cirrus
ABUNDANCE
Astrophysics::Earth and Planetary Astrophysics
dust
COEFFICIENT
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
METALLICITY
galaxies: ISM
INTERSTELLAR DUST
Zdroj: ASTRONOMY & ASTROPHYSICS
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2019, 631, pp.A102. ⟨10.1051/0004-6361/201936314⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 631, pp.A102. ⟨10.1051/0004-6361/201936314⟩
ISSN: 1432-0746
0004-6361
DOI: 10.1051/0004-6361/201936314⟩
Popis: 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 the disc-averaged dust emissivity at 250 micrometres, and from this, the absorption cross section per H atom and per dust mass. The emissivity requires one assumption, which is the CO-to-H_2 conversion factor, and the dust temperature is additionally required for the absorption cross section per H atom; yet another constraint on the dust-to-hydrogen ratio D/H, depending on metallicity, is required for the absorption cross section dust mass. Results: We find epsilon(250) = 0.82 +/- 0.07 MJy sr^-1 (1E20 H cm^-2)^-1 for galaxies with 4 < F(250)/F(500) < 5. This depends only weakly on the adopted CO-to-H_2 conversion factor. The value is almost the same as that for the Milky Way at the same colour ratio. Instead, for F(250)/F(500) > 6, epsilon(250) 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 the absorption cross sections 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.
13 pages, 6 figures, 2 tables, A&A accepted
Databáze: OpenAIRE
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