The Luminosity-Metallicity relation in the local universe from the 2dF Galaxy Redshift Survey

Details The Luminosity-Metallicity relation in the local universe from the 2dF Galaxy Redshift Survey The Luminosity-Metallicity relation in the local universe from the 2dF Galaxy Redshift Survey

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..613l&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

We investigate the Luminosity - Metallicity (L - Z) relation in the local universe (0<0.15) using spectra extracted from the 2dF Galaxy Redshift Survey. We use « standard » diagnostic diagrams to distinguish star-forming galaxies from AGNs, and propose new diagnostic diagrams using « blue » emission lines only. Oxygen-to-hydrogen (O/H) abundance ratios are estimated using the « strong-line » method. We confirm the existence of the luminosity-metallicity relation over a large range of abundances (~2dex) and luminosity (~9mags). Our L - Z relation is much steeper than previous determinations using samples of « normal » irregular and spiral galaxies. This difference seems to be primarily due to the choice of the galaxy sample.

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