Hybrid accretion disks in active galactic nuclei. I - Structure and spectra
1991; IOP Publishing; Volume: 380; Linguagem: Inglês
10.1086/170564
ISSN1538-4357
Autores Tópico(s)Atomic and Molecular Physics
Resumoview Abstract Citations (102) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hybrid Accretion Disks in Active Galactic Nuclei. I. Structure and Spectra Wandel, Amri ; Liang, Edison P. Abstract We provide a unified treatment of the two distinct states of vertically thin AGN accretion disks: a cool (T~10^6^ K) optically thick solution, and a hot (T_e_~10^9^ K, optically thin solution. We introduce a generalized formalism and a new radiative cooling equation valid in both regimes. We find a new luminosity limit L < L_E_ at which the hot and cool α solutions merge into a single solution of intermediate optical depth. For the hot solutions we consider four cases: different ion and electron temperatures or ions and electrons in thermal equilibrium, with Comptonized bremsstrahlung or unsaturated Compton cooling. Analytic solutions for the disk structure are given, and output spectra are computed numerically. This is used to demonstrate the prospect of fitting AGN broad-band spectra, containing both the UV bump as well as hard X-ray and gamma-ray tail, using a single accretion disk model. Such models make definite predictions on the observed spectrum, such as the relation between the hard X-ray spectral index, the UV-to-X- ray luminosity ratio, and a ~1 MeV feature. Publication: The Astrophysical Journal Pub Date: October 1991 DOI: 10.1086/170564 Bibcode: 1991ApJ...380...84W Keywords: Accretion Disks; Active Galactic Nuclei; Astronomical Spectroscopy; Optical Thickness; Luminosity; Magnetohydrodynamic Stability; Radiant Cooling; Secular Variations; Astrophysics; ACCRETION; GALAXIES: NUCLEI full text sources ADS | data products SIMBAD (1)
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