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

DOI: 
10.1093/mnras/stx186
Publication date: 
22/05/2017
Main author: 
Pérez-Montero E.
IAA authors: 
Pérez-Montero, E.
Authors: 
Pérez-Montero E., Amorín R.
Journal: 
Monthly Notices of the Royal Astronomical Society
Publication type: 
Article
Volume: 
467
Pages: 
1287-1293
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. © 2017 The Authors.

Database: 
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85018266944&doi=10.1093%2fmnras%2fstx186&partnerID=40&md5=a139c7af4f51bb09956e02731032815e
Keywords: 
Galaxies: abundances; ISM: abundances; Methods: data analysis