Insights on the dusty torus and neutral torus from optical and X-ray obscuration in a complete volume limited hard X-ray AGN sample
| العنوان: | Insights on the dusty torus and neutral torus from optical and X-ray obscuration in a complete volume limited hard X-ray AGN sample |
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| المؤلفون: | Leonard Burtscher, R. A. Riffel, E. K. S. Hicks, Eckhard Sturm, Amiel Sternberg, A. Schnorr-Müller, David J. Rosario, Ming-yi Lin, R. Genzel, Rogemar A. Riffel, A. Janssen, Sylvain Veilleux, Javier Graciá-Carpio, G. Orban de Xivry, Marc Schartmann, Thaisa Storchi-Bergmann, A. Contursi, F. Muller Sanchez, Dieter Lutz, Witold Maciejewski, Claudio Ricci, Linda J. Tacconi, M. Koss, Ric Davies |
| المصدر: | Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS ASTROPHYSICAL JOURNAL Astrophysical Journal Artículos CONICYT CONICYT Chile instacron:CONICYT |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Active galactic nucleus, active [Galaxies], Sublimação (Física), Astrophysics::High Energy Astrophysical Phenomena, Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Espectros astronômicos, Poeira cosmica, Deslocamento para o vermelho, education, QC, Astrophysics::Galaxy Astrophysics, QB, Cosmic dust, Physics, education.field_of_study, seyfert [Galaxies], Astronomy, Astronomy and Astrophysics, Torus, Astrophysics - Astrophysics of Galaxies, Galaxy, Redshift, Galaxias seyfert, 3. Good health, galaxies [X-rays], Galáxias ativas, Gas torus, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), nuclei [Galaxies], Order of magnitude, Nucleo galatico |
| الوصف: | We describe a complete volume limited sample of nearby active galaxies selected by their 14-195keV luminosity, and outline its rationale for studying the mechanisms regulating gas inflow and outflow. We describe also a complementary sample of inactive galaxies, selected to match the AGN host galaxy properties. The active sample appears to have no bias in terms of AGN type, the only difference being the neutral absorbing column which is two orders of magnitude greater for the Seyfert 2s. In the luminosity range spanned by the sample, log L_{14-195keV} [erg/s] = 42.4-43.7, the optically obscured and X-ray absorbed fractions are 50-65%. The similarity of these fractions to more distant spectroscopic AGN samples, although over a limited luminosity range, suggests that the torus does not strongly evolve with redshift. Our sample confirms that X-ray unabsorbed Seyfert 2s are rare, comprising not more than a few percent of the Seyfert 2 population. At higher luminosities, the optically obscured fraction decreases (as expected for the increasing dust sublimation radius), but the X-ray absorbed fraction changes little. We argue that the cold X-ray absorption in these Seyfert 1s can be accounted for by neutral gas in clouds that also contribute to the broad line region (BLR) emission; and suggest that a geometrically thick neutral gas torus co-exists with the BLR and bridges the gap to the dusty torus. Accepted for ApJ; 15 pages with 10 figures |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1538-4357 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::663210885909db7eab78384b04b968c4 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....663210885909db7eab78384b04b968c4 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15384357 |
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