An analysis of the X and UV emissions of active galactic nuclei

Details An analysis of the X and UV emissions of active galactic nuclei An analysis of the X and UV emissions of active galactic nuclei

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cha%26a..11..263y&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 11, Issue 3, p. 263-268.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Under the assumption of spherical accretion, we used the synchrotron radiation mechanism to derive the relation between the 2 keV X luminosity (1X) and the 2500 A UV luminosity (1op) of active galactic nuclei. We found that, when the accretion rate is low, 1X is directly proportional to 1op. When the accretion rate is high, because the X photons come from a dense region close to the central black hole, they are repeatedly Compton scattered by the thermal electrons and ``dragged'' into the black hole. In this case, by calculating the relation between the dragging region and the accretion rate, we found 1X proportional to 1opp to the power 0.30, thus explaining the tendency towards ``saturation'' in the observed 1X - 1op curve.

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