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http://hdl.handle.net/20.500.12386/31110
Titolo: | The assembly of dusty galaxies at z ≥ 4: statistical properties | Autori: | Graziani, L. SCHNEIDER, RAFFAELLA Ginolfi, M. HUNT, Leslie Kipp Maio, U. Glatzle, M. Ciardi, B. |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 494 | Fascicolo: | 1 | Da pagina:: | 1071 | Abstract: | The recent discovery of high-redshift dusty galaxies implies a rapid dust enrichment of their interstellar medium (ISM). To interpret these observations, we run a cosmological simulation in a 30 h<SUP>-1</SUP> cMpc/size volume down to z ≍ 4. We use the hydrodynamical code dustygadget, which accounts for the production of dust by stellar populations and its evolution in the ISM. We find that the cosmic dust density parameter (Ω<SUB>d</SUB>) is mainly driven by stellar dust at z ≳ 10, so that mass- and metallicity-dependent yields are required to assess the dust content in the first galaxies. At z ≲ 9, the growth of grains in the ISM of evolved systems [log(M<SUB>⋆</SUB>/M<SUB>☉</SUB>) > 8.5] significantly increases their dust mass, in agreement with observations in the redshift range 4 ≲ z < 8. Our simulation shows that the variety of high-redshift galaxies observed with the Atacama Large Millimeter Array can naturally be accounted for by modelling the grain growth time-scale as a function of the physical conditions in the gas cold phase. In addition, the trends of dust-to-metal and dust-to-gas (D) ratios are compatible with the available data. A qualitative investigation of the inhomogeneous dust distribution in a representative massive halo at z ≍ 4 shows that dust is found from the central galaxy up to the closest satellites along polluted filaments with log(D) ≤ -2.4, but sharply declines at distances d ≳ 30 kpc along many lines of sight, where log(D) ≲ -4.0. | URI: | http://hdl.handle.net/20.500.12386/31110 | URL: | https://academic.oup.com/mnras/article/494/1/1071/5811194 http://arxiv.org/abs/1909.07388v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa796 | Bibcode ADS: | 2020MNRAS.494.1071G | Fulltext: | open |
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