Chemical abundances of Seyfert 2 AGNs - II. N2 metallicity calibration based on SDSS
We present a semi-empirical calibration between the metallicity (Z) of Seyfert 2 active galactic nuclei and the N2 = log([N HP.6584/11 cy) emission-line intensity ratio. This calibration was derived through the [0 m]..5007/[0 u[),3727 versus N2 diagram containing observational data and photoionizati...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/206707 |
| Acceso en línea: | http://hdl.handle.net/10261/206707 |
| Access Level: | acceso abierto |
| Palabra clave: | Galaxies: abundances Galaxies: active Galaxies: evolution Galaxies: formation Galaxies: ISM Galaxies: nuclei |
| Sumario: | We present a semi-empirical calibration between the metallicity (Z) of Seyfert 2 active galactic nuclei and the N2 = log([N HP.6584/11 cy) emission-line intensity ratio. This calibration was derived through the [0 m]..5007/[0 u[),3727 versus N2 diagram containing observational data and photoionization model results obtained with the CLOUDY code. The observational sample consists of 463 confirmed Seyfert 2 nuclei (redshift z < 0.4) taken from the Sloan Digital Sky Survey DR7 data set. The obtained Z N2 relation is valid for the range 0.3 r< ( Z/Zo) 2.0 that corresponds to 0.7 < (N2) < 0.6. The effects of varying the ionization parameter (U), electron density and the slope of the spectral energy distribution on the Z estimations are of the order of the uncertainty produced by the error measurements of N2. This result indicates the large reliability of our Z N2 calibration. A relation between U and the IOutj/[OIII line ratio, almost independent of other nebular parameter, was obtained. |
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