Mathematics – Logic
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ign..confe..15d&link_type=abstract
Ionized Gaseous Nebulae. Mexico City November 21- 24, 2000, meeting abstract
Mathematics
Logic
Scientific paper
We present a new and simple abundance estimator based on the [NII]λ6584/Hα ratio. We have calibrated the estimator using a compilation of HII galaxies with known Oxygen abundance, plus photoionization models. The narrow relation of O/H with [NII]/Hα holds as well for metal-rich galaxies (12+log(O/H) > 8.5) for which O/H is inferred by R23 and S23 methods (e.g., Díaz &Pérez-Montero 2000). We have used the NII estima tor to select low metallicity candidates from redshift survey quality data. We have found six metal-poor galaxies (7.6 < 12+log(O/H) < 8.0) selected from the Durham/UKST Galaxy Redshift Survey (Ratcliffe et al. 1998). We find that metal-poor galaxies represent only a small fraction (~ 0.2%) of the total observed emission line galaxies. Our next approach is to use the NII estimator in a large redshift survey of galaxies such as 2dF aiming to significantly increase the present sample of metal-poor galaxies, and perhaps more importantly, to study the cosmological abundance evolution. Díaz, A. I., & Pérez-Montero, E. 2000, MNRAS, 312, 130 Ratcliffe et al. 1998, MNRAS, 300, 417
Denicolo Glenda
Terlevich Elena
Terlevich Robert
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