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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Dust emission profiles of DustPedia galaxies
Astronomy and Astrophysics, Volume 622, Article A132, Year 2019
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Description
Most radiative transfer models assume that dust in spiral galaxies is distributed exponentially. In this paper our goal is to verify this assumption by analysing the two-dimensional large-scale distribution of dust in galaxies from the DustPedia sample. For this purpose, we have made use of Herschel imaging in five bands, from 100 to 500 μm, in which the cold dust constituent is primarily traced and makes up the bulk of the dust mass in spiral galaxies. For a subsample of 320 disc galaxies, we successfully performed a simultaneous fitting with a single Srsic model of the Herschel images in all five bands using the multi-band modelling code galfitm. We report that the Srsic index n, which characterises the shape of the Srsic profile, lies systematically below 1 in all Herschel bands and is almost constant with wavelength. The average value at 250 μm is 0:67 ± 0:37 (187 galaxies are fitted with n 250 = 0:75, 87 galaxies have 0:75 < n 250 = 1:25, and 46 with n 250 > 1:25). Most observed profiles exhibit a depletion in the inner region (at r < 0:3-0:4 of the optical radius r 25 ) and are more or less exponential in the outer part. We also find breaks in the dust emission profiles at longer distances (0:5-0:6) r25 which are associated with the breaks in the optical and near-infrared. We assumed that the observed deficit of dust emission in the inner galaxy region is related to the depression in the radial profile of the Hi surface density in the same region because the atomic gas reaches high enough surface densities there to be transformed into molecular gas. If a galaxy has a triggered star formation in the inner region (for example, because of a strong bar instability, which transfers the gas inwards to the centre, or a pseudobulge formation), no depletion or even an excess of dust emission in the centre is observed. © 2019 ESO.
Authors & Co-Authors
Baes, Maarten
Belgium, Ghent
Universiteit Gent
Bianchi, Simone
Italy, Florence
Osservatorio Astrofisico Di Arcetri
Casasola, Viviana
Italy, Florence
Osservatorio Astrofisico Di Arcetri
Italy, Bologna
Istituto Di Radioastronomia, Bologna
Clark, Christopher J.R.
United Kingdom, Cardiff
Cardiff University
Davies, Jonathan I.
United Kingdom, Cardiff
Cardiff University
de Looze, Ilse
Belgium, Ghent
Universiteit Gent
United Kingdom, London
University College London
de Vis, Pieter
France, Paris
Cnrs Centre National de la Recherche Scientifique
Fritz, Jacopo
Mexico, Morelia
Unam Campus Morelia
Galametz, Maud
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Galliano, Frédéric
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Jones, Anthony P.
France, Paris
Cnrs Centre National de la Recherche Scientifique
Lianou, Sophia
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Madden, Suzanne C.
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Smith, Matthew W.L.
United Kingdom, Cardiff
Cardiff University
Trčka, Ana
Belgium, Ghent
Universiteit Gent
Viaene, Sébastien
Belgium, Ghent
Universiteit Gent
United Kingdom, Hatfield
University of Hertfordshire
Xilouris, Emmanuel M.
Greece, Athens
National Observatory of Athens
Statistics
Citations: 20
Authors: 17
Affiliations: 13
Identifiers
Doi:
10.1051/0004-6361/201833932
ISSN:
00046361
Research Areas
Environmental
Mental Health