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Astron. Astrophys. 326, 99-107 (1997)

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5. Conclusion

We have studied the effects of general relativity on the spectrum emitted by our model of re-illumination of the accretion disk of Seyfert I galaxies by a relativistic plasma of leptons. This hot source could be the result of a strong shock between an abortive jet coming from the disk and the interstellar medium. It appears that, by opposition with the standard model of accretion disk including relativistic effects (Sun & Malkan 1989 ; Novikov & Thorne 1973 ), there are few differences between the Newtonian and relativistic case, unless the height of the hot source is small enough, i.e. [FORMULA]. Indeed a region of the disk, of length scale of the order of the height [FORMULA] of the hot source above the disk (and thus no disturb by the presence of the black-hole for large [FORMULA]), is equally illuminated and thus predominates in the spectrum.

In a future work, we will study the detailed structure of the hot source, taking into account the microphysical processes like pair production and particle acceleration. As mentioned in Paper I, these processes could determine the unknown parameters (upper energy cut-off, spectral index, disk temperature) that are still free in the present theory.

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© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998