Tootfinder

Empirical calibration for helium abundance determinations in Active Galactic Nuclei
O. L. Dors, G. C. Almeida, C. B. Oliveira, S. R. Flury, R. Riffel, R. A. Riffel, M. V. Cardaci, G. F. H\"agele, G. S. Ilha, A. C. Krabbe, K. Z. Arellano-C\'ordova, P. C. Santos, I. N. Morais
https://arxiv.org/abs/2406.03259

Empirical calibration for helium abundance determinations in Active Galactic Nuclei
For the first time, a calibration between the HeI $\lambda5876$/H$β$ emission line ratio and the helium abundance $y$=12+log(He/H) for Narrow line regions (NLRs) of Seyfert~2 Active Galactic Nuclei (AGN) is proposed. In this context, observational data (taken from the SDSS-DR15 and from the literature) and direct abundance estimates (via the $T_{\rm e}$-method) for a sample of 65 local ($z \: < \: 0.2$) Seyfert~2 nuclei are considered. The resulting calibration estimates the $y$ abundance with…

Empirical calibration for helium abundance determinations in Active Galactic Nuclei
O. L. Dors, G. C. Almeida, C. B. Oliveira, S. R. Flury, R. Riffel, R. A. Riffel, M. V. Cardaci, G. F. H\"agele, G. S. Ilha, A. C. Krabbe, K. Z. Arellano-C\'ordova, P. C. Santos, I. N. Morais
https://arxiv.org/abs/2406.03259

Empirical calibration for helium abundance determinations in Active Galactic Nuclei
For the first time, a calibration between the HeI $\lambda5876$/H$β$ emission line ratio and the helium abundance $y$=12+log(He/H) for Narrow line regions (NLRs) of Seyfert~2 Active Galactic Nuclei (AGN) is proposed. In this context, observational data (taken from the SDSS-DR15 and from the literature) and direct abundance estimates (via the $T_{\rm e}$-method) for a sample of 65 local ($z \: < \: 0.2$) Seyfert~2 nuclei are considered. The resulting calibration estimates the $y$ abundance with…

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