Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251..529c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, Aug. 1, 1991, p. 529-540. Research supported by An
Astronomy and Astrophysics
Astronomy
11
Active Galactic Nuclei, Magnetic Fields, X Ray Sources, Compton Effect, Quasars, Synchrotron Radiation
Scientific paper
The upper limits on the magnetic energy density in the compact X-ray emission region of the Seyfert galaxies NGC 4051 and NGC 6814 and the quasars 3C273, 3C279, and H1821 + 643 are estimated using synchrotron self-Compton theory. It is shown that equipartition magnetic fields are excluded from the X-ray emission regions of several AGN under the assumption that the X-rays are due to inverse-Compton scattering of EUV photons by relativistic electrons. The AGN under consideration exhibit the full range of active galaxies from low-luminosity Seyfert galaxies to highly luminous quasars. It is suggested that much stronger magnetic fields are present at smaller radii and that they support a population of very dense clouds. Free-free absorption allows the strong equipartition magnetic field to support a blanket of dense cold clouds which hide its radiation signature.
Celotti Annalisa
Fabian Andrea C.
Ghisellini Gabriele
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