Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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The Evolution of the Mass-Metallicity Relation at 0.20 < z < 0.35

  • Chung, Jiwon (Department of Astronomy and Space Science, Chungnam National University) ;
  • Rey, Soo-Chang (Department of Astronomy and Space Science, Chungnam National University) ;
  • Sung, Eon-Chang (Korea Astronomy and Space Science Institute)
  • Received : 2013.02.09
  • Accepted : 2013.03.04
  • Published : 2013.03.15
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Abstract

We present a spectroscopic study of 343 blue compact galaxies (BCGs) at 0.20 < z < 0.35 from the Sloan Digital Sky Survey (SDSS) DR7 data. We derive gas phase oxygen abundance using the empirical and direct method. Stellar masses of galaxies are derived from the STARLIGHT code. We also derive star formation rates of galaxies based on $H{\alpha}$ emission line from the SDSS as well as far-ultraviolet (FUV) flux from the Galaxy Evolution Explorer GR6 data. Evolution of the luminosity-metallicity and mass-metallicity (M-Z) relations with redshift is observed. At a given luminosity and mass, galaxies at higher redshifts appear to be biased to low metallicities relative to the lower redshift counterparts. Furthermore, low mass galaxies show higher specific star formation rates (SSFRs) than more massive ones and galaxies at higher redshifts are biased to higher SSFRs compared to the lower redshift sample. By visual inspection of the SDSS images, we classify galaxy morphology into disturbed or undisturbed. In the M-Z relation, we find a hint that morphologically disturbed BCGs appear to exhibit low metallicities and high SSFRs compared to undisturbed counterparts. We suggest that our results support downsizing galaxy formation scenario and star formation histories of BCGs are closely related with their morphologies.

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References

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