X-Ray Emission from Active Galactic Nuclei : Comptonization of Self-Absorbed Cyclotron Higher Harmonics

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We investigate the emission of self-absorbed cyclotron higher harmonics and the subsequent Comptonization in a hot magnetized plasma in connection with the hard X-ray emission of active galactic nuclei. The absorption coefficients of cyclotron harmonics are numerically calculated for the relativistic Maxwellian distribution of electrons. For a typical case, such as with the electron temperature of 〜 2× 10^9 K, the magnetic field of 〜2×10^4 G and the optical thickness to Thomson scattering of 〜1, the plasma turns out to be optically thick up to a few hundred times the electron cyclotron frequency. By the Monte Carlo simulation we show that these soft photons in the infrared band are then Comptonized to produce hard X-ray emission with a power law spectrum. These results are applied to the hot inner region of the disk accretion onto a supermassive black hole, where such a plasma state is realized naturally. Although the resultant intensity and spectrum of the X-ray emission depend on the detailed structure of the accretion flow, they may well explain the dominant observed features. This mechanism is also applied to the galactic X-ray source Cyg X-1.
理論物理学刊行会の論文
1982-02-25