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The G-dwarf distribution in star-forming galaxies: A tug of war between infall and outflow

Spitoni, E. ; Calura, F. ; Silva Aguirre, V. ; Gilli, R.

Astronomy and astrophysics (Berlin), 2021-04, Vol.648, p.L5 [Periódico revisado por pares]

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  • Título:
    The G-dwarf distribution in star-forming galaxies: A tug of war between infall and outflow
  • Autor: Spitoni, E. ; Calura, F. ; Silva Aguirre, V. ; Gilli, R.
  • É parte de: Astronomy and astrophysics (Berlin), 2021-04, Vol.648, p.L5
  • Descrição: In the past, the cumulative metallicity distribution function (CMDF) turned out to be a useful tool to constrain the accretion history of various components of the Milky Way. In this Letter, by means of analytical, leaky-box chemical evolution models (i.e. including both infall and galactic outflows), we study the CMDF of local star-forming galaxies that follow two fundamental empirical scaling relations, namely the mass-metallicity and main sequence relations. Our analysis shows that galactic winds, which are dominant mostly in low-mass systems, play a fundamental role in shaping this function and, in particular, in determining its steepness and curvature. We show that the CMDF of low-mass ( M ⋆ / M ⊙  ≤ 10 9.5 ) and high-mass ( M ⋆ / M ⊙  >  10 10.5 ) galaxies substantially deviate from the results of a ‘closed-box’ model, as the evolution of the former (latter) systems is mostly dominated by outflows (infall). In the context of galactic downsizing, we show that downward-concave CMDFs (associated with systems with extremely small infall timescales and with very strong winds) are more frequent in low-mass galaxies, which include larger fractions of young systems and present more substantial deviations from equilibrium between gas accretion and reprocessing (either via star formation or winds).
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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