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Título: | The mid-infrared high-ionization lines from active galactic nuclei and star-forming galaxies |
Autor: | Pereira-Santaella, Miguel CSIC ORCID; Diamond-Stanic, A. M.; Alonso-Herrero, A. CSIC ORCID; Rieke, George H. | Fecha de publicación: | 2010 | Editor: | University of Chicago Press | Citación: | Astrophysical Journal 725: 2270- 2280 (2010) | Resumen: | We used Spitzer/Infrared Spectrograph spectroscopic data on 426 galaxies including quasars, Seyferts, LINERs, and Hii galaxies to investigate the relationship among the mid-IR emission lines. There is a tight linear correlation between the [Ne v]14.3 μm and 24.3 μm (97.1 eV) and the [Oiv]25.9 μm (54.9 eV) high-ionization emission lines. The correlation also holds for these high-ionization emission lines and the [Ne iii]15.56 μm (41 eV) emission line, although only for active galaxies. We used these correlations to calculate the [Ne iii] excess due to star formation in Seyfert galaxies. We also estimated the [Oiv] luminosity due to star formation in active galaxies and determined that it dominates the [Oiv] emission only if the contribution of the active nucleus to the total luminosity is below 5%. We find that the active galactic nucleus dominates the [Oiv] emission in most Seyfert galaxies, whereas star formation adequately explains the observed [Oiv] emission in optically classified Hii galaxies. Finally, we computed photoionization models to determine the physical conditions of the narrow-line region where these high-ionization lines originate. The estimated ionization parameter range is -2.8 < log U < -2.5 and the total hydrogen column density range is 20 < log nH (cm-2) < 21. © 2010 The American Astronomical Society. All rights reserved. | URI: | http://hdl.handle.net/10261/74431 | DOI: | 10.1088/0004-637X/725/2/2270 | Identificadores: | doi: 10.1088/0004-637X/725/2/2270 issn: 0004-637X |
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Pereira-Santaella.pdf | 1,22 MB | Adobe PDF | Visualizar/Abrir |
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