Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-18
Astronomy and Astrophysics
Astrophysics
12 pages, 12 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society
Scientific paper
10.1111/j.1365-2966.2007.12213.x
In this work we present a study of the strong optical collisional emission lines of Ne and Ar in an heterogeneous sample of ionized gaseous nebulae for which it is possible to derive directly the electron temperature and hence the chemical abundances of neon and argon. We calculate using a grid of photoionization models new ionization correction factors for these two elements and we study the behaviour of Ne/O and Ar/O abundance ratios with metallicity. We find a constant value for Ne/O, while there seems to be some evidence for the existence of negative radial gradients of Ar/O over the disks of some nearby spirals. We study the relation between the intensities of the emission lines of [NeIII] at 3869 \AA and [OIII] at 4959 \AA and 5007 \AA. This relation can be used in empirical calibrations and diagnostic ratios extending their applicability to bluer wavelengths and therefore to samples of objects at higher redshifts. Finally, we propose a new diagnostic using [OII], [NeIII] and Hdelta emission lines to derive metallicities for galaxies at high z.
Contini Thierry
Diaz Angeles I.
Hagele Guillermo F.
Pérez-Montero Enrique
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