INVESTIGADORES
HÄGELE Guillermo Federico
artículos
Título:
Neon and argon optical emission lines in ionized gaseous nebulae: implications and applications
Autor/es:
PÉREZ-MONTERO, ENRIQUE; HÄGELE, GUILLERMO F.; CONTINI, THIERRY; DÍAZ, ÁNGELES I.
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2007 vol. 381 p. 125 - 135
ISSN:
0035-8711
Resumen:
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 Ne and Ar. 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 discs of some nearby spirals. We study
the relation between the intensities of the emission lines of [NeIII] at
3869 Å and [OIII] at 4959 and 5007 Å. 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 Hδ emission lines to derive metallicities for galaxies
at high z.