Chemical abundances in spiral and irregular galaxies. O and N abundances derived from global emission--line spectra

Details Chemical abundances in spiral and irregular galaxies. O and N abundances derived from global emission--line spectra Chemical abundances in spiral and irregular galaxies. O and N abundances derived from global emission--line spectra

2004-05-17

arxiv.org/abs/astro-ph/0405312v1

Astron.Astrophys. 423 (2004) 427-440

Astronomy and Astrophysics

Astrophysics

15 pages, 17 figures, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20035745

The validity of oxygen and nitrogen abundances derived from the global emission-line spectra of galaxies via the P-method has been investigated using a collection of published spectra of individual HII regions in irregular and spiral galaxies. The conclusions of Kobulnicky, Kennicutt & Pizagno (1999) that global emission-line spectra can reliably indicate the chemical properties of galaxies has been confirmed. It has been shown that the comparison of the global spectrum of a galaxy with a collection of spectra of individual HII regions can be used to distinguish high and low metallicity objects and to estimate accurate chemical abundances in a galaxy. The oxygen and nitrogen abundances in samples of UV-selected and normal nearby galaxies have been determined. It has been found that the UV-selected galaxies occupy the same area in the N/O -- O/H diagram as individual HII regions in nearby galaxies. Finally, we show that intermediate-redshift galaxies systematically deviate from the metallicity -- luminosity trend of local galaxies.

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