Using photoionization models to derive carbon and oxygen gas-phase abundances in the rest UV

Perez-Montero, Enrique; Amorin, Ricardo

Abstract

We present a new method to derive oxygen and carbon abundances using the ultraviolet (UV) lines emitted by the gas phase ionized by massive stars. The method is based on the comparison of the nebular emission-line ratios with those predicted by a large grid of photoionization models. Given the large dispersion in the O/H-C/O plane, our method first fixes C/O using ratios of appropriate emission lines and, in a second step, calculates O/H and the ionization parameter from carbon lines in the UV. We find abundances totally consistent with those provided by the direct method when we apply this method to a sample of objects with an empirical determination of the electron temperature using optical emission lines. The proposed methodology appears as a powerful tool for systematic studies of nebular abundances in star-forming galaxies at high redshift.

Más información

Título según WOS: ID WOS:000398416700003 Not found in local WOS DB
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 467
Número: 2
Editorial: Oxford Academic
Fecha de publicación: 2017
Página de inicio: 1287
Página final: 1293
DOI:

10.1093/mnras/stx186

Notas: ISI