New quantitative nitrogen abundance estimations in a sample of Seyfert 2 Active Galactic Nuclei

O. L. DORS; K. Z. ORELLANO-CÓRDOVA; M. V. CARDACI; G. F. HÄGELE

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2017

0035-8711

We obtained new quantitative determinations of the nitrogen abundance and a consistent relation between nitrogen and oxygen abundances for a sample of Seyfert 2 galaxies located at redshift z < 0:1. We carried out this analysis using the Cloudy code to build detailed photoionization models. We were able to re-produce observed optical narrow emission line intensities for 47 sources compiled from the literature. Our results show that Seyfert 2 nuclei have nitrogen abundances ranging from 0:3 to 7:5 times the solar value. We derived the relation log(N=H)=1.05(+/-0.09)[log(O=H)]-0.33(+/-0.32). Results for N/O vs. O/H abundance ratios derived for Seyfert 2s are in consonance with those recently derived for a sample of extragalactic disk Hii regions with high metallicity.