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

K. Rowlands, S. Dye, Alfonso Aragon-Salamanca, E. da Cunha, D. J. B. Smith, S. A. Eales, H. L. Gomez, I. Smail, Mehmet Alpaslan, C. J. R. Clark, S. P. Driver, Edo Ibar, R. J. Ivison, A. Robotham, M. W. L. Smith, E. Valiante, Nathan Bourne, Stephen Maddox, Loretta Dunne

Research output: Contribution to journalArticlepeer-review

Abstract

We present a comparison of the physical properties of a rest-frame 250-mu m-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(-70)(+80) M-circle dot 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-circle dot yr(-1)). The SMGs harbour a substantial mass of dust (1.2(-0.2)(+0.3) x 10(9) M-circle dot), compared to (1.6 +/- 0.1) x 10(8) M-circle dot 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.
Original languageEnglish
Pages (from-to)1017-1039
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume441
Issue number2
DOIs
Publication statusPublished - 1 Jun 2014

Keywords

  • dust
  • extinction
  • galaxies: evolution
  • galaxies: fundamental parameters
  • galaxies: high-redshift
  • galaxies: ISM
  • submillimetre: galaxies

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