The Metallicity Evolution of Star-forming Galaxies from Redshift 0 to 3 : Combining Magnitude-limited Survey with Gravitational Lensing Article - Janvier 2013

T.-T. Yuan, L. J. Kewley, J. Richard

T.-T. Yuan, L. J. Kewley, J. Richard, « The Metallicity Evolution of Star-forming Galaxies from Redshift 0 to 3 : Combining Magnitude-limited Survey with Gravitational Lensing  », The Astrophysical Journal, janvier 2013, p. 9. ISSN 0004-637X

Abstract

We present a comprehensive observational study of the gas-phase metallicity of star-forming galaxies from z 0 → 3. We combine our new sample of gravitationally lensed galaxies with existing lensed and non-lensed samples to conduct a large investigation into the mass-metallicity (MZ) relation at z > 1. We apply a self-consistent metallicity calibration scheme to investigate the metallicity evolution of star-forming galaxies as a function of redshift. The lensing magnification ensures that our sample spans an unprecedented range of stellar mass (3 × 107 to 6 × 1010 M &sun ;). We find that at the median redshift of z = 2.07, the median metallicity of the lensed sample is 0.35 dex lower than the local SDSS star-forming galaxies and 0.18 dex lower than the z 0.8 DEEP2 galaxies. We also present the z 2 MZ relation using 19 lensed galaxies. A more rapid evolution is seen between z 1 → 3 than z 0 → 1 for the high-mass galaxies (109.5 M &sun ; < M sstarf < 1011 M &sun ;), with almost twice as much enrichment between z 1 → 3 than between z 1 → 0. We compare this evolution with the most recent cosmological hydrodynamic simulations with momentum-driven winds. We find that the model metallicity is consistent with the observed metallicity within the observational error for the low-mass bins. However, for higher masses, the model overpredicts the metallicity at all redshifts. The overprediction is most significant in the highest mass bin of 1010-1011 M &sun ;.

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