Publication Date:
2016-02-20
Description:
We investigate the evolution of the mass–metallicity ( M – Z ) relation with a large sample of 53 444 star-forming galaxies (SFGs) at 0.04 〈 z 〈 0.12, selected from the catalogue of Max-Planck-Institute for Astrophysics–John Hopkins University (MPA–JHU) emission-line measurements for the Sloan Digital Sky Survey Data Release 7. Regarding the sample of SFGs, we correct the observational bias and raise the aperture covering fractions to check the reliability of the metallicity evolution. (i) We show that the redshift evolution of the log (Hα) and log([O iii ]) luminosities is displayed in our sample. (ii) We find the metallicity evolution of ~0.15 dex at log ( M * /M ) ~ 9.3 in SFGs at 0.04 〈 z 〈 0.12. (iii) After applying the luminosity thresholds of log ( L Hα ) 〉 41.0 and $\log (L_{\rm [O\,\scriptscriptstyle {III}]}) 〉 39.7$ , we find that the metallicity evolution is shown well, and that the evolution of the star formation rate (SFR) is still shown well under the latter luminosity threshold, but the evolution is not observed under the former. (iv) The evolution of the M – Z relation seems to disappear at about log ( M * /M ) 〉 10.0 after applying the luminosity threshold of log ( L Hα ) 〉 41.0 or $\log (L_{\rm [O\,\scriptscriptstyle {III}]}) 〉 39.7$ . (v) We find α = 0.09 and α = 0.07 in the equation, μ = log M * – αlog (SFR), for log ( L Hα ) 〉 41.0 and $\log (L_{\rm [O\,\scriptscriptstyle {III}]}) 〉 39.7$ samples, respectively, and these imply that the evolution of the M – Z relation might have a weaker dependence on the SFR in our sample.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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