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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2(441), p. 1017-1039

DOI: 10.1093/mnras/stu510

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Herschel-ATLAS: Properties of dusty massive galaxies at low and high redshifts

Journal article published in 2014 by K. Rowlands, L. Dunne, S. Dye ORCID, A. Aragón-Salamanca, S. Maddox ORCID, E. da Cunha, D. J. B. Smith ORCID, N. Bourne, S. Eales, H. L. Gomez, I. Smail ORCID, M. Alpaslan ORCID, C. J. R. Clark, S. Driver ORCID, E. Ibar and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present a comparison of the physical properties of a rest-frame $250μ$m selected sample of massive, dusty galaxies from $01$ SMGs have an average SFR of $390^{+80}_{-70}\,$M$_⊙$yr$^{-1}$ which is 120 times that of the low-redshift sample matched in stellar mass to the SMGs (SFR$=3.3\pm{0.2}$ M$_⊙$yr$^{-1}$). The SMGs harbour a substantial mass of dust ($1.2^{+0.3}_{-0.2}\times{10}^9\,$M$_⊙$), compared to $(1.6±0.1)\times{10}^8\,$M$_⊙$ for low-redshift dusty galaxies. At low redshifts the dust luminosity is dominated by the diffuse ISM, whereas a large fraction of the dust luminosity in SMGs originates from star-forming regions. At the same dust mass SMGs are offset towards a higher SFR compared to the low-redshift H-ATLAS galaxies. This is not only due to the higher gas fraction in SMGs but also because they are undergoing a more efficient mode of star formation, which is consistent with their bursty star-formation histories. The offset in SFR between SMGs and low-redshift galaxies is similar to that found in CO studies, suggesting that dust mass is as good a tracer of molecular gas as CO. ; Comment: 17 pages, 8 pages in Appendix, 12 figures, 2 tables. Accepted for publication in MNRAS. Minor typos corrected to match published version