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The rapid evolution of dust content in galaxies over the last five billion years

Gomez, Haley Louise, Dunne, L., Smith, D. J. B. and da Cunha, E. 2013. The rapid evolution of dust content in galaxies over the last five billion years. Presented at: IAUS 292: Molecular Gas, Dust, and Star Formation in Galaxies, Beijing, China, 20-24 August 2012. Symposium S292 (Molecular Gas, Dust, and Star Formation in Galaxies). Proceedings of the International Astronomical Union , vol. 292. Cambridge: Cambridge University Press, pp. 275-278. 10.1017/S174392131300135X

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The Herschel-ATLAS (H-ATLAS) will provide an unrivalled sample of galaxies, probing the normal star-forming submillimetre population of galaxies for the first time. Here, we exploit the Science Demonstration Phase (SDP) data to model the evolution of the interstellar content of galaxies in recent history. The most massive H-ATLAS galaxies show a large increase in the dust content five billion years ago compared to the present epoch. These observations are difficult to explain using standard dust models, one possibility could be contributions from a non-stellar source of dust e.g. grain growth in dense clouds; this would imply that less than 10% of dust would be condensed in stellar atmospheres. Alternatively, an initial mass function which becomes top heavy at high star formation rate densities could also explain this discrepancy.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Cambridge University Press
ISSN: 1743-9213
Last Modified: 04 Jun 2017 05:38

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