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

Beeston, R. A, Wright, A H, Maddox, S, Gomez, H L, Dunne, L, Driver, S P, Robotham, A., Clark, C J R, Vinsen, K, Takeuchi, T T, Popping, G, Bourne, N, Bremer, M N, Phillipps, S, Moffett, A J, Baes, M, Bland-Hawthorn, J, Broug, S, De Vis, P, Eales, S A, Holwerda, B W, Loveday, J, Liske, J, Smith, M W L, Smith, D J B, Valiante, E, Vlahakis, C and Wang, L (2018) GAMA/H-ATLAS: the local dust mass function and cosmic density as a function of galaxy type - a benchmark for models of galaxy evolution. Monthly Notices Of The Royal Astronomical Society. ISSN 0035-8711

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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) × 10^7 h^2/70 Mo, α = (-1.22 ± 0:01), Φ*= (6.26 ± 0.28) × 10^-3 h^3/70 Mpc^-3 dex^-1. The resulting dust mass density parameter integrated down to 10^4 M☉ 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
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Depositing User: Billy Wichaidit
Date Deposited: 07 Jun 2018 10:18
Last Modified: 15 Jun 2018 16:12
URI: http://sro.sussex.ac.uk/id/eprint/76371

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Project NameSussex Project NumberFunderFunder Ref
Astronomy rolling grantG0278STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/I000976/1