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Artículo

X-rays as the dominant excitation mechanism of [Fe II] and H2 emission lines in active galaxies

Dors, Oli L.; Riffel, Rogemar A.; Cardaci, Monica VivianaIcon ; Hägele, Guillermo FedericoIcon ; Krabbe, Angela; Pérez Montero, Enrique; Rodrigues, Irapuan
Fecha de publicación: 05/2012
Editorial: Wiley Blackwell Publishing, Inc
Revista: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We investigate the excitation mechanisms of near-infrared [Fe II] and H2 emission lines observed in active galactic nuclei (AGNs). We built a photoionization model grid considering a two-component continuum: one component accounts for the `big bump´ component peaking at 1Ryd and another represents the X-ray source that dominates the continuum emission at high energies. Photoionization models considering as ionizing source a spectral energy distribution obtained from photometric data of Seyfert 2 Mrk 1066 taken from the literature were considered. Results of these models were compared with a large sample of observational long-slit and Integral field Unit (IFU) spectroscopy data of the nuclear region for a sample of active objects. We found that the correlation between the observational [Fe II] lambda 1.2570μm/Pa beta and H2 lambda 2.1218μm/Brγ is well reproduced by our models, as are the relationships that involve the H2 emission-line ratios observed in the spectroscopic data. We conclude that heating by X-rays produced by active nuclei can be considered a common and very important mechanism of excitation of [Fe II] and H2.
Palabras clave: Galaxies , Seyfert Galaxies , Infrared Galaxies , Interstellar Medium
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/42650
DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20600.x
URL: https://academic.oup.com/mnras/article/422/1/252/1020740
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Citación
Dors, Oli L.; Riffel, Rogemar A.; Cardaci, Monica Viviana; Hägele, Guillermo Federico; Krabbe, Angela; et al.; X-rays as the dominant excitation mechanism of [Fe II] and H2 emission lines in active galaxies; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 422; 1; 5-2012; 252-260
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