Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Dors, O. L. [1] ; Freitas-Lemes, P. [1] ; Amores, E. B. [2] ; Perez-Montero, E. [3] ; Cardaci, V, M. ; Hagele, G. F. [4, 5] ; Armah, M. [1] ; Krabbe, A. C. [1] ; Faundez-Abans, M. [6]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Univ Vale Paraiba, Av Shishima Hifumi 2911, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[2] Univ Estadual Feira De Santana, Dept Fis, Av Transnordestina S-N, BR-44036900 Feira De Santana, BA - Brazil
[3] Inst Astrofis Andalucia, Camino Bajo Huetor S-N, Aptdo 3004, E-18080 Granada - Spain
[4] Cardaci, M., V, Inst Astrofis La Plata, Ave Centenario Paseo Bosque S-N, B1900FWA, La Plata - Argentina
[5] Cardaci, M., V, Univ Nacl La Plata, Fac Ciencias Astron & Geofis, Paseo Bosque S-N, RA-1900 La Plata - Argentina
[6] Lab Nacl Astrofis, MCTIC, BR-37504364 Itajuba, MG - Brazil
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 492, n. 1, p. 468-479, FEB 2020.
Citações Web of Science: 0
Resumo

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 (T-e-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 less than or similar to 0.4). We used the Sloan Digital Sky Survey (SDSS) and NASA/IPAC Extragalactic Database (NED) to selected optical (3000 < lambda (angstrom) < 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 T-e-method. We found that the oxygen abundance estimations via the strong-line methods differ from each other up to similar to 0.8 dex, with the largest discrepancies in the low-metallicity regime (12 + log(O/H) less than or similar to 8.5). We confirmed that the T-e-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. (AU)

Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
Beneficiário:Elisabete Maria de Gouveia Dal Pino
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários