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 Relative Articles On the Metallicity of Star-forming Dwarf Galaxies Narrow He II emission in star-forming galaxies at low metallicity. Stellar wind emission from a population of Very Massive Stars Gas Inflow and Metallicity Drops in Star-forming Galaxies Relations of stellar mass between electron temperature-based metallicity of star-forming galaxies in a wide mass range New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies The chemical evolution of local star forming galaxies: Radial profiles of ISM metallicity, gas mass, and stellar mass and constraints on galactic accretion and winds Metal-poor, Strongly Star-Forming Galaxies in the DEEP2 Survey: The Relationship between Stellar Mass, Temperature-based Metallicity, and Star Formation Rate Metallicity gradients in local field star-forming galaxies: Insights on inflows, outflows, and the coevolution of gas, stars and metals On the universality of luminosity-metallicity and mass-metallicity relations for compact star-forming galaxies at redshifts 0 < z < 3 Modeling Tracers of Young Stellar Population Age in Star-Forming Galaxies More...
Physics  2011

# Stellar metallicity of star-forming galaxies at z ~ 3

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Abstract:

The stellar metallicity is a direct measure of the amount of metals present in a galaxy, as a large part of the metals lie in its stars. In this paper we investigate new stellar metallicity indicators suitable for high-z galaxies studying the stellar photospheric absorption lines in the rest frame ultraviolet, hence sampling predominantly young hot stars. We defined these new indicators based on the equivalent widths (EW) of selected features using theoretical spectra created with the evolutionary population synthesis code Starburts99. We used them to compute the stellar metallicity for a sample of UV-selected galaxies at z > 3 from the AMAZE survey using very deep (37h per object) VLT/FORS spectra. Moreover, we applied the new metallicity indicators to eight additional high redshift galaxies found in literature. We then compared stellar and gas-phase metallicities measured from the emission lines for all these galaxies, finding that within the errors the two estimates are in good agreement, with possible tendency to have stellar metallicities lower than the gas phase ones. For the first time, we are able to study the stellar mass-metallicity relation at z > 3. We find that the metallicity of young, hot stars in galaxies at z \sim 3 have similar values of the aged stars in local SDSS galaxies, contrary to what observed for the gas phase metallicity.

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