Evolution of fundamental parameters in emission line galaxies up to z = 0.4
In this work we focus on the evolution of the SFR, metallicity of the
gas, and morphology of galaxies at low redshift in search of signs of
evolution. We analyzed the evolution of the SFR, metallicity, and
morphology, through the mass-metallicity, luminosity-metallicity,
SFR-stellar mass, and SFR-metallicity relationships of star-forming
galaxies from SDSS-DR5 (Sloan Digital Sky Survey-Data Release 5), using
redshift intervals in bins of 0.1 from ˜ 0 to 0.4We used data
processed with the STARLIGHT spectral synthesis code, correcting the
fluxes for dust extinction, and estimating metallicities using the
R_{23} method. We estimated the SFR for our samples of galaxies, and
studied the luminosity and mass-metallicity relations.The comparison of
our local (0.04 < z < 0.1) with our higher redshift sample (0.3
< z < 0.4) shows that the metallicity, the SFR, and morphology
evolve toward lower values of metallicity, higher SFRs, and late-type
morphologies for the redshift range 0.3 < z < 0.4.Finally, we find
a fundamental plane for field galaxies relating the SFR, gas
metallicity, and stellar mass for SF galaxies in the local universe. One
of the applications of this plane would be to estimate stellar masses
from SFR and metallicity. High redshift data from the literature at
redshift ˜ 0.85, 2.2, and 3.5, do not show evidence of evolution
in this fundamental plane.