Spectral energy distributions of active galactic nuclei from an accretion disk with advective coronal flow |
| |
| Institution: | 1. Institut de Recherche Technologique Jules Verne, Bouguenais 44340, France;2. CNRS, Laboratoire de Thermique et Énergie de Nantes, Nantes 44306, France;3. CNRS, Institut de Recherche en Informatique de Toulouse, Toulouse 31062, France;4. Institut de Calcul Intensif, Centrale Nantes, Nantes 44300, France |
| |
| Abstract: | To explain the broad-band spectral energy distributions (SED) of Seyfert nuclei and QSOs, we study the emission spectrum emerging from a vertical disk–corona structure composed of a two-temperature plasma by solving hydrostatic equilibrium and radiative transfer self-consistently. Our model can nicely reproduce the soft X-ray excess with α (Lν ∝ ν?α) of about 1.5 and the hard tail extending to ～50 keV with α～0.5. The different spectral slopes (α～1.5 below 2 keV and ～0.5 above) are the results of different emission mechanisms: unsaturated Comptonization in the former and a combination of Comptonization, bremsstrahlung, and reflection of the coronal radiation at the disk–corona boundary in the latter. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
