The effect of metal-rich infall on galactic chemical evolution

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Chemical Evolution, Galactic Evolution, Intergalactic Media, Interstellar Matter, Metallicity, Molecular Clouds, Abundance, Chemical Composition, Disk Galaxies, Spiral Galaxies

Scientific paper

The problem of a nonprimordial chemical composition of the gas accreted by the disks of spiral galaxies is investigated by means of numerical models of galactic chemical evolution. The models have been computed assuming an infall metallicity Zf ranging between 0 and the solar metallicity. The comparison of the model predictions with the corresponding quantities observed in the disk of the Galaxy shows that an infall metallicity up to 0.1 of the solar value gives results equivalent to those derived for primordial infalls and is in agreement with the observational constraints. The fit to the data worsens for increasing metal abundance of the infall and becomes unacceptable for Zf/solar metallicity ratios of less than 0.4. This upper limit to the infall metallicity is consistent with the current observational estimates of the chemical composition of galactic High Velocity Clouds.

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