Artículo
Emirical calibration for helium abundance determinations in active galactic nuclei
Dors, Oli L.; Almeida Gouvea, Celine; Oliveira, C. B.; Flury, S. R.; Riffel, Romina Elisabet; Riffel, R. A.; Cardaci, Monica Viviana
; Hägele, Guillermo Federico
; Ilha, G. S.; Krabbe, A. C.; Arellano Córdova, K. Z.; Santos, P. C.; Morais, I. N.
Fecha de publicación:
09/2024
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society. Letters
ISSN:
1745-3925
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
For the first time, a calibration between the He I λ5876/Hβ emission line ratio and the helium abundance y = 12 + log(He/H) for Narrow line regions of Seyfert 2 Active Galactic Nuclei is proposed. In this context, observational data (taken from the SDSS-DR15 and from the literature) and direct abundance estimates (via the Te-method) for a sample of 65 local ( z<0.2 ) Seyfert 2 nuclei are considered. The resulting calibration estimates the y abundance with an average uncertainty of 0.02 dex. Applying our calibration to spectroscopic data containing only strong emission lines, it yields a helium abundance distribution similar to that obtained via the Te-method. Some cautions must be considered to apply our calibration for Seyfert 2 nuclei with high values of electron temperature (≳20000K) or ionization parameter ( logU > −2.0).
Palabras clave:
ISM: ABUNDANCES
,
GALAXIES: ABUNDANCES
,
GALAXIES: ACTIVE
,
GALAXIES: NUCLEI
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Dors, Oli L.; Almeida Gouvea, Celine; Oliveira, C. B.; Flury, S. R.; Riffel, Romina Elisabet; et al.; Emirical calibration for helium abundance determinations in active galactic nuclei; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society. Letters; 533; 1; 9-2024; 1-5
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