Electron temperature fluctuations in Seyfert galaxies

Author:

Riffel Rogemar A1ORCID,Dors Oli L2ORCID,Krabbe Angela C2ORCID,Esteban César34ORCID

Affiliation:

1. Departamento de Física, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil

2. Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, Cep 12244-000 São José dos Campos, SP, Brazil

3. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Spain

4. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain

Abstract

ABSTRACT We use Gemini GMOS-IFU observations of three luminous nearby Seyfert galaxies (Mrk 79, Mrk 348, and Mrk 607) to estimate the electron temperature (Te) fluctuations in the inner 0.4–1.1 kpc region of these galaxies. Based on Te determinations through the [O iii]λ5007/λ4363 emission line ratio of each spaxel, temperature variations are quantified by computing the integrated value of the temperature fluctuation parameter (t2) projected in the plane of the sky $t_{\rm A}^{\rm 2}$, for the first time in active galactic nuclei (AGNs). We find $t_{\rm A}^{\rm 2}$ values of 0.135, 0.039, and 0.015 for Mrk 79, Mrk 348, and Mrk 607, respectively, which are of the same order or larger than the maximum values reported in star-forming regions and planetary nebulae. Taking into account that $t_{\rm A}^{\rm 2}$ should be considered a lower limit of the total t2 in the nebular volume, the results suggest that the impact of such fluctuations on chemical abundance determinations can be important in some AGNs.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul

FAPESP

Agencia Estatal de Investigación

Ministerio de Ciencia e Innovación

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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