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2005MNRAS.362.1143M - Mon. Not. R. Astron. Soc., 362, 1143-1156 (2005/October-1)
The [OII]λ3727/Hα ratio of emission-line galaxies in the 2dF Galaxy Redshift Survey.
MOUHCINE M., LEWIS I., JONES B., LAMAREILLE F., MADDOX S.J. and CONTINI T.
Abstract (from CDS):
We use the R23parameter to estimate the gas-phase oxygen abundance and find that the extinction-corrected [Oii]λ3727/Hα ratio depends on the oxygen abundance. For 12 + log(O/H) ≳ 8.4, we confirm that the emission-line ratio decreases with increasing metallicity. We have extended the relationship further to the metal-poor regime, 12 + log(O/H) ≲ 8.4, and find that the correlation between the extinction-corrected [Oii]λ3727/Hα ratio and the metallicity reverses in comparison to the relationship for metal-rich galaxies. For metal-poor galaxies, in contrast with metal-rich galaxies, the variation of extinction-corrected [Oii]λ3727/Hα ratio is correlated with the ionization states of the interstellar gas.
The relative importance of the metallicity or the excitation state in determining the extinction-corrected [Oii]λ3727/Hα ratio depends on galaxy luminosity.
Abstract Copyright: 2005 RAS
Journal keyword(s): surveys - galaxies: fundamental parameters - galaxies: general - galaxies: statistics
VizieR on-line data: <Available at CDS (J/MNRAS/362/1143): Data never received at CDS>
Simbad objects: 1
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