X-rays as the dominant excitation mechanism of [Fe II] and H2 emission lines in active galaxies
| Autor: | Dors Junior, Oli L., Riffel, Rogemar A., Cardaci, Mónica Viviana, Hägele, Guillermo Federico, Krabbe, Ângela C., Pérez Montero, Enrique, Rodrigues, Irapuan |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Seyfert [Galaxies]
Ciencias Astronómicas Galaxies: Seyfert Seyfert galaxies Infrared galaxies Ciencias Físicas purl.org/becyt/ford/1.3 [https] Astrophysics::Cosmology and Extragalactic Astrophysics Infrared: galaxies Galaxies purl.org/becyt/ford/1 [https] Astronomía Galaxies: ISM galaxies [Infrared] Interstellar medium ISM [Galaxies] Astrophysics::Galaxy Astrophysics CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | 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 Seyert 2 Mrk1066 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]λ 1.2570μm/Paβ and H2λ2.1218μm/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. Facultad de Ciencias Astronómicas y Geofísicas |
| Databáze: | OpenAIRE |
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