Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30...87r&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
5
Black Holes (Astronomy), Galactic Nuclei, Quasars, Stellar Magnetic Fields, Thermal Plasmas, X Ray Sources, High Energy Electrons, Luminosity, Relativistic Particles, Relativistic Plasmas, X Ray Spectra
Scientific paper
It is suggested that it is not surprising that the dominant energy output from active nuclei should generally be in the X-ray band; dilute gas in deep potential well will inevitably get hot enough to emit X-rays, and the conditions favor the acceleration of relativistic electrons. It is also pointed out that the thermal plasma in galactic nuclei may get so hot that the kinetic temperatures exceed electron mass times c-squared. The fact that 'radio loud' quasars tend to be stronger X-ray sources than quiet quasars of the same optical magnitude suggests that at least part of the X-rays from the former are 'nonthermal'. The class of galactic nuclei which display the most purely 'nonthermal' phenomena may be those in which the primary power supply comes from the 'spin-down' of a massive black hole mediated by a magnetic field anchored in material near the hole. Finally, there are clear-cut scaling laws which suggest that the physical conditions and flow patterns in galactic X-ray sources may closely resemble those in galactic nuclei.
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