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Título: | Measures of the Soft X-ray Excess as an Eigenvector 1 Parameter for Active Galactic Nuclei |
Autor: | Bensch, Katarzyna; Olmo, Ascensión del CSIC ORCID; Sulentic, Jack W. CSIC; Perea, Jaime CSIC ORCID; Marziani, Paola CSIC ORCID | Palabras clave: | Galaxies: active Quasars Emission lines X-rays |
Fecha de publicación: | 2015 | Editor: | Indian Academy of Sciences | Citación: | Journal of Astrophysics and Astronomy 36: 467- 474 (2015) | Resumen: | We present a preliminary analysis of X-ray data of quasars in the context of the 4D eigenvector 1 parameter space (Sulentic et al.2000a, b). 4DE1 serves as a surrogate H-R diagram for representing empirical diversity among quasars and identifying the physical drivers of the diversity. The soft X-ray spectral index (Γ) was adopted as one of the key 4DE1 that correlates contrasting extremes in Type 1 properties. 4DE1 motivated the hypothesis of two quasar populations (A and B) divided by L/L≈0.2. Pop. A is a largely radio-quiet population with FWHM Hβ<4000 km/s and often showing a soft X-ray excess. Pop. B is a mix of radio-quiet and a majority of RL quasars shows only a hard X-ray power-law SED. The X-ray separation was based upon earlier ROSAT and ASCA data but we now confirm this dichotomy with large samples of X-ray spectra obtained with XMM-Newton and SWIFT. One popular idea connects the soft excess in Pop. A quasars as a signature of thermal emission from a hot accretion disk in sources radiating close to the Eddington limit. | Versión del editor: | http://dx.doi.org/10.1007/s12036-015-9355-8 | URI: | http://hdl.handle.net/10261/133335 | DOI: | 10.1007/s12036-015-9355-8 | ISSN: | 0973-7758 |
Aparece en las colecciones: | (IAA) Artículos |
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J_A&A_36_4_467.pdf | JA&A_36_4_2015 | 543,46 kB | Adobe PDF | Visualizar/Abrir |
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