Synthesis of accretion disk and nonthermal source models for active galactic nuclei

Details Synthesis of accretion disk and nonthermal source models for active galactic nuclei Synthesis of accretion disk and nonthermal source models for active galactic nuclei

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..122b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 122-134. Research supported by the Lawrence Livermore

Astronomy and Astrophysics

Astronomy

30

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Nonthermal Radiation, Spectrophotometry, Electron Energy, Luminosity, Pair Production, Relativistic Electron Beams, Spectral Energy Distribution, X Ray Spectra

Scientific paper

Multiwavelength observations of 12 AGN are fitted with a model consisting of a nonthermal source surrounding an accretion disk around a massive black hole. It is demonstrated that the combined model provides a reasonable explanation of the observed intrinsic continuum. Values of the central engine's defining parameters are derived. The accretion disk radiates at 0.25-0.5 of the Eddington luminosity. The mass is of order 4 x 10 to the 8th solar for moderately luminous QSOs and Seyfert galaxies in the sample. The nonthermal source has a radius of about 70 Schwarzschild radii, a magnetic field of about 300 G, and an electron density of about 6 x 10 to the 6th/cu cm. The luminosities in the synchrotron, accretion disk, and scattered components are comparable. The electron distribution shape is consistent with injection of a power law with radiative losses dominating above a break energy and an energy-independent loss mechanism below the break energy.

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