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

Rowlands, K., Dunne, L., Dye, S., Aragón-Salamanca, A., Maddox, S., da Cunha, E., Smith, D.J.B., Bourne, N., Eales, S., Gomez, H.L., Smail, I., Alpaslan, M., Clark, C.J.R., Driver, S., Ibar, E., Ivison, R.J., Robotham, A., Smith, M.W.L. and Valiante, E. (2014) Herschel-ATLAS: properties of dusty massive galaxies at low and high redshifts. Monthly Notices of the Royal Astronomical Society, 441 (2). pp. 1017-1039. ISSN 0035-8711

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We present a comparison of the physical properties of a rest-frame 250-μm-selected sample of massive, dusty galaxies from 0 < z < 5.3. Our sample comprises 29 high-redshift submillimetre galaxies (SMGs) from the literature and 843 dusty galaxies at z < 0.5 from the Herschel-Astrophysical TeraHertz Large Area Survey (H-ATLAS), selected to have a similar stellar mass to the SMGs. The z > 1 SMGs have an average star formation rate (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 ± 0.2 M⊙ yr−1). The SMGs harbour a substantial mass of dust (

1.2+0.3−0.2×109 M⊙), compared to (1.6 ± 0.1) × 108 M⊙ for low-redshift dusty galaxies. At low redshifts, the dust luminosity is dominated by the diffuse interstellar medium, 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.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/727879
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society.
Keywords: dust, extinction – galaxies: evolution – galaxies: fundamental parameters – galaxies: high-redshift – galaxies: ISM – submillimetre: galaxies
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.1093/mnras/stu510
Depositing User: Aragon-salamanca, Alfonso
Date Deposited: 20 Apr 2017 10:22
Last Modified: 04 May 2020 16:47
URI: https://eprints.nottingham.ac.uk/id/eprint/42054

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