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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Dust grain size evolution in local galaxies: a comparison between observations and simulations
Monthly Notices of the Royal Astronomical Society, Volume 515, No. 4, Year 2022
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Description
The evolution of the dust grain size distribution has been studied in recent years with great detail in cosmological hydrodynamical simulations taking into account all the channels under which dust evolves in the interstellar medium. We present a systematic analysis of the observed spectral energy distribution of a large sample of galaxies in the local Universe in order to derive not only the total dust masses but also the relative mass fraction between small and large dust grains (DS/DL). Simulations reproduce fairly well the observations except for the high-stellar mass regime where dust masses tend to be overestimated. We find that ∼45 per cent of galaxies exhibit DS/DL consistent with the expectations of simulations, while there is a subsample of massive galaxies presenting high DS/DL (log (DS/DL) ∼-0.5), and deviating from the prediction in simulations. For these galaxies which also have high-molecular gas mass fractions and metallicities, coagulation is not an important mechanism affecting the dust evolution. Including diffusion, transporting large grains from dense regions to a more diffuse medium where they can be easily shattered, would explain the observed high DS/DL values in these galaxies. With this study, we reinforce the use of the small-to-large grain mass ratio to study the relative importance of the different mechanisms in the dust life cycle. Multiphase hydrodynamical simulations with detailed feedback prescriptions and more realistic subgrid models for the dense phase could help to reproduce the evolution of the dust grain size distribution traced by observations. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Authors & Co-Authors
Relaño, Mónica
Spain, Granada
Universidad de Granada
de Looze, Ilse
Belgium, Ghent
Universiteit Gent
United Kingdom, London
University College London
Saintonge, Amélie
United Kingdom, London
University College London
Nagamine, Kentaro
Japan, Suita
Osaka University
Japan, Tokyo
The University of Tokyo
United States, Las Vegas
University of Nevada, Las Vegas
Lamperti, Isabella
Spain, Torrejon de Ardoz
Centro de Astrobiología Csic-inta
Lisenfeld, Ute
Spain, Granada
Universidad de Granada
Smith, Matthew W.L.
United Kingdom, Cardiff
Cardiff University
Xiao, Ting
China, Hangzhou
Zhejiang University
Sargent, Mark T.
United Kingdom, Brighton
University of Sussex
Statistics
Citations: 4
Authors: 9
Affiliations: 14
Identifiers
Doi:
10.1093/mnras/stac2108
ISSN:
00358711
Study Approach
Systematic review