The assembly of dusty galaxies at $z \geq 4$: statistical properties
| Autor: | L. K. Hunt, Martin Glatzle, L. Graziani, Raffaella Schneider, U. Maio, Michele Ginolfi, B. Ciardi |
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| Přispěvatelé: | ITA |
| Rok vydání: | 2019 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Galaxies: formation 01 natural sciences Omega Cosmology: theory Galaxies: evolution 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 10. No inequality 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Cosmic dust Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Redshift Galaxy Interstellar medium 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Content (measure theory) Production (computer science) Halo Astrophysics::Earth and Planetary Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1909.07388 |
| Popis: | 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$h^{-1}$ cMpc/size volume down to $z \approx 4$. 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 ($��_{\rm d}$) is mainly driven by stellar dust at $z \gtrsim 10$, so that mass- and metallicity-dependent yields are required to assess the dust content in the first galaxies. At $z \lesssim 9$ the growth of grains in the ISM of evolved systems (Log$(M_{\star}/M_{\odot})>8.5$) significantly increases their dust mass, in agreement with observations in the redshift range $4 \lesssim z < 8$. Our simulation shows that the variety of high redshift galaxies observed with ALMA can naturally be accounted for by modeling the grain-growth timescale as a function of the physical conditions in the gas cold phase. In addition, the trends of dust-to-metal (DTM) and dust-to-gas (${\cal D}$) ratios are compatible with the available data. A qualitative investigation of the inhomogeneous dust distribution in a representative massive halo at $z \approx 4$ shows that dust is found from the central galaxy up to the closest satellites along polluted filaments with $\rm Log({\cal D}) \leq -2.4$, but sharply declines at distances $d \gtrsim 30$ kpc along many lines of sight, where $\rm Log({\cal D}) \lesssim -4.0$. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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