Chemical abundances of Seyfert 2 AGNs – I. Comparing oxygen abundances from distinct methods using SDSS

Dors, O. L.; Freitas-Lemes, P.; Amôres, E. B.; Pérez-Montero, E.; Cardaci, M. V.; Hägele, G. F.; Armah, M.; Krabbe, A. C.; Faúndez-Abans, M.

doi:10.1093/mnras/stz3492

Title: Chemical abundances of Seyfert 2 AGNs – I. Comparing oxygen abundances from distinct methods using SDSS

Journal Article · 16 December 2019 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stz3492 · OSTI ID:1581037

^[1]; Freitas-Lemes, P. ^[1]; Amôres, E. B. ^[2]; Pérez-Montero, E. ^[3];

^[4]; Hägele, G. F. ^[4]; Armah, M. ^[1]; Krabbe, A. C. ^[1]; Faúndez-Abans, M. ^[5]

Universidade do Vale do Paraíba. Av. Shishima Hifumi, 2911, CEP 12244-000 São José dos Campos, SP, Brazil
Departamento de Física, Universidade Estadual de Feira de Santana, Av. Transnordestina, S/N, CEP 44036-900 Feira de Santana, BA, Brazil
Instituto de Astrofísica de Andalucía, Camino Bajo de Huétor s/n, Aptdo. 3004, E18080-Granada, Spain
Instituto de Astrofísica de La Plata, Avenida Centenario (Paseo del Bosque) S/N, B1900FWA La Plata, Argentina, Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
MCTIC/ Laboratório Nacional de Astrofísica, CEP 37.504-364 Itajubá, MG, Brazil

ABSTRACT We compare the oxygen abundance (O/H) of the narrow-line regions (NLRs) of Seyfert 2 AGNs obtained through strong-line methods and from direct measurements of the electron temperature (Te-method). The aim of this study is to explore the effects of the use of distinct methods on the range of metallicity and on the mass–metallicity relation of active galactic nuclei (AGNs) at low redshifts (z ≲ 0.4). We used the Sloan Digital Sky Survey (SDSS) and NASA/IPAC Extragalactic Database (NED) to selected optical (3000 < λ(Å) < 7000) emission line intensities of 463 confirmed Seyfert 2 AGNs. The oxygen abundances of the NLRs were estimated using the theoretical Storchi-Bergmann et al. calibrations, the semi-empirical N2O2 calibration, the Bayesian H ii-Chi-mistry code and the Te-method. We found that the oxygen abundance estimations via the strong-line methods differ from each other up to ∼0.8 dex, with the largest discrepancies in the low-metallicity regime ($$\rm 12+\log (O/H) \: \lesssim \: 8.5$$). We confirmed that the Te-method underestimates the oxygen abundance in NLRs, producing unreal subsolar values. We did not find any correlation between the stellar mass of the host galaxies and the metallicity of their AGNs. This result is independent of the method used to estimate Z.

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Sponsoring Organization:: USDOE

OSTI ID:: 1581037

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 492; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. II. Spatially Resolved Mass Outflow Rates for the QSO2 Markarian 34 Revalski, M.; Dashtamirova, D.; Crenshaw, D. M. The Astrophysical Journal, Vol. 867, Issue 2 https://doi.org/10.3847/1538-4357/aae3e6	journal	November 2018
The Mass–Metallicity Relation of Local Active Galaxies Thomas, Adam D.; Kewley, Lisa J.; Dopita, Michael A. The Astrophysical Journal, Vol. 874, Issue 1 https://doi.org/10.3847/1538-4357/ab08a1	journal	March 2019
Mixing between Seyfert and H ii Region Excitation in Local Active Galaxies Thomas, Adam D.; Kewley, Lisa J.; Dopita, Michael A. The Astrophysical Journal, Vol. 861, Issue 1 https://doi.org/10.3847/2041-8213/aacce7	journal	June 2018

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