4.6 Article

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

期刊

ASTRONOMY & ASTROPHYSICS
卷 648, 期 -, 页码 -

出版社

EDP SCIENCES S A
DOI: 10.1051/0004-6361/202140836

关键词

galaxies: abundances; galaxies: evolution; galaxies: fundamental parameters; ISM: general

资金

  1. Danish National Research Foundation [DNRF106]
  2. Independent Research Fund Denmark [7027-00096B]
  3. PRIN MIUR [20173ML3WW_001]
  4. INAF Main-Stream [1.05.01.86.31]

向作者/读者索取更多资源

Analyzing the CMDFs of local star-forming galaxies, we find that galactic winds play a significant role in shaping the function, with low-mass systems showing a greater impact. The CMDFs of low-mass and high-mass galaxies deviate notably from a 'closed-box' model, as the evolution of these systems is influenced by outflows and infall. Additionally, in the context of galactic downsizing, low-mass galaxies are more likely to exhibit downward-concave CMDFs, indicating larger fractions of young systems and substantial deviations from equilibrium.
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-star/M-circle dot <= 10(9.5)) and high-mass (M-star/M-circle dot> 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).

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