GAMA/H-ATLAS: the local dust mass function and cosmic density as a function of galaxy type-A benchmark for models of galaxy evolution

R. A. Beeston, A. H. Wright, S. Maddox, H. L. Gomez, L. Dunne, S. P. Driver, A. Robotham, C. J. R. Clark, K. Vinsen, T. T. Takeuchi, G. Popping, N. Bourne, M. N. Bremer, S. Phillipps, A. J. Moffett, M. Baes, S. Brough, P. De Vis, S. A. Eales, B. W. HolwerdaJ. Loveday, M. W. L. Smith, D. J. B. Smith, C. Vlahakis, L. Wang

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We present the dust mass function (DMF) of 15,750 galaxies with redshift z < 0.1, drawn from the overlapping area of the GAMA and H-ATLAS surveys. The DMF is derived using the density corrected Vmax method, where we estimate Vmax using: (i) the normal photometric selection limit (pVmax) and (ii) a bivariate brightness distribution (BBD) technique, which accounts for two selection effects. We fit the data with a Schechter function, and find M∗ = (4.65 ± 0.18) × 107 h270 M, α = (−1.22 ± 0.01), φ = (6.26 ± 0.28) × 10−3 h370 Mpc−3 dex−1. The resulting dust mass density parameter integrated down to 104M is Ωd = (1.11 ± 0.02) × 10−6 which implies the mass fraction of baryons in dust is fmb = (2.40±0.04) ×10−5; cosmic variance adds an extra 7-17 per cent uncertainty to the quoted statistical errors. Our measurements have fewer galaxies with high dust mass than predicted by semi-analytic models. This is because the models include too much dust in high stellar mass galaxies. Conversely, our measurements find more galaxies with high dust mass than predicted by hydrodynamical cosmological simulations. This is likely to be from the long timescales for grain growth assumed in the models. We calculate DMFs split by galaxy type and find dust mass densities of Ωd = (0.88 ± 0.03) × 10−6 and Ωd = (0.060 ± 0.005) × 10−6 for late-types and early-types respectively. Comparing to the equivalent galaxy stellar mass functions (GSMF) we find that the DMF for late-types is well matched by the GMSF scaled by (8.07 ± 0.35) × 10−4.
Original languageEnglish
Pages (from-to)1077–1099
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume479
Issue number1
Early online date5 Jun 2018
DOIs
Publication statusPublished - Sept 2018

Keywords

  • Galaxies: statistics
  • Galaxies: mass function
  • Dust

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