Journal
ASTRONOMY & ASTROPHYSICS
Volume 495, Issue 1, Pages 73-81Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200810558
Keywords
galaxies: evolution; galaxies: fundamental parameters; galaxies: abundances; galaxies: starburst
Categories
Funding
- CNRS-INSU
- Spanish National Plan for Astronomy and Astrophysics [AYA-2004-08260-C03-03]
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Aims. We present a continuation of our study about the relation between stellar mass and gas-phase metallicity in the VIMOS VLT Deep Survey (VVDS). In this work we extend the determination of metallicities up to redshift approximate to 1.24 for a sample of 42 star-forming galaxies with a mean redshift value of 0.99. Methods. For a selected sample of emission-line galaxies, we use both diagnostic diagrams and empirical calibrations based on [OII] emission lines along with the empirical relation between the intensities of the [OIII] and [NeIII] emission lines and the theoretical ratios between Balmer recombination emission lines to identify star-forming galaxies and to derive their metallicities. We derive stellar masses by fitting the whole spectral energy distribution with a set of stellar population synthesis models. Results. These new methods allow us to extend the mass-metallicity relation to higher redshift. We show that the metallicity determinations are consistent with more established strong-line methods. Taken together this allows us to study the evolution of the mass-metallicity relation up to z approximate to 1.24 with good control of systematic uncertainties. We find an evolution with redshift of the average metallicity of galaxies very similar to those reported in the literature: for a given stellar mass, galaxies at z similar to 1 have, on average, a metallicity similar to 0.3 dex lower than galaxies in the local universe. However we do not see any significant metallicity evolution between redshifts z similar to 0.7 (Paper I) and z similar to 1.0 (this paper). We find also the same flattening of the mass-metallicity relation for the most massive galaxies as reported in Paper I at lower redshifts, but again no apparent evolution of the slope is seen between z similar to 0.7 and z similar to 1.0.
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