TY - JOUR
T1 - Star-forming galaxies in SDSS
T2 - Signs of metallicity evolution
AU - Lara-López, M. A.
AU - Cepa, J.
AU - Bongiovanni, A.
AU - Castañeda, H.
AU - Pérez García, A. M.
AU - Fernández Lorenzo, M.
AU - Póvic, M.
AU - Sánchez-Portal, M.
PY - 2009/1
Y1 - 2009/1
N2 - Context. Evolution of galaxies through cosmic time has been widely studied at high redshift, but there are a few studies in this field at lower redshifts. However, low-redshifts studies will provide important clues to the evolution of galaxies, furnishing the required link between local and high-redshift universe.Aims. In this work we focus on the metallicity of the gas in spiral galaxies at low redshift looking for signs of chemical evolution. We analyze the metallicity contents of star forming galaxies of similar luminosities at different redshifts, we studied the metallicity of star forming galaxies from SDSS-DR5 (Sloan Digital Sky Survey-Data Release 5), using different redshift intervals from 0.1 to 0.4.Methods. We used the public data of SDSS-DR5 processed with the STARLIGHT spectral synthesis code, correcting the fluxes for dust extinction, estimating metallicities using the R23 method, and analyzing the samples with respect to the [N II] γ6583/[O II] γ3727 line ratio.Results. From a final sample of 207 galaxies, we find a decrement in 12+log(O/H) corresponding to the redshift interval 0.3 < z < 0.4 of ~0.1 dex with respect to the rest of the sample, which can be interpreted as evidence of the metallicity evolution in low-z galaxies..
AB - Context. Evolution of galaxies through cosmic time has been widely studied at high redshift, but there are a few studies in this field at lower redshifts. However, low-redshifts studies will provide important clues to the evolution of galaxies, furnishing the required link between local and high-redshift universe.Aims. In this work we focus on the metallicity of the gas in spiral galaxies at low redshift looking for signs of chemical evolution. We analyze the metallicity contents of star forming galaxies of similar luminosities at different redshifts, we studied the metallicity of star forming galaxies from SDSS-DR5 (Sloan Digital Sky Survey-Data Release 5), using different redshift intervals from 0.1 to 0.4.Methods. We used the public data of SDSS-DR5 processed with the STARLIGHT spectral synthesis code, correcting the fluxes for dust extinction, estimating metallicities using the R23 method, and analyzing the samples with respect to the [N II] γ6583/[O II] γ3727 line ratio.Results. From a final sample of 207 galaxies, we find a decrement in 12+log(O/H) corresponding to the redshift interval 0.3 < z < 0.4 of ~0.1 dex with respect to the rest of the sample, which can be interpreted as evidence of the metallicity evolution in low-z galaxies..
KW - Galaxies: abundances
KW - Galaxies: evolution
KW - Galaxies: starburst
UR - http://www.scopus.com/inward/record.url?scp=58149279174&partnerID=8YFLogxK
U2 - 10.1051/0004-6361:200811033
DO - 10.1051/0004-6361:200811033
M3 - Artículo
SN - 0004-6361
VL - 493
SP - L5-L8
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 1
ER -