Fitting multi-wavelength continuum of AGN with improved accretion disk models

  • Wei-Hsin Sun
  • Matthew A. Malkan
VI. Theories of the Continuum
Part of the Lecture Notes in Physics book series (LNP, volume 307)


We present fits to the UV-Optical-IR spectra of 60 quasars and active galactic nuclei using improved black hole accretion disk models. For both Kerr and Schwarzschild black holes, we calculated the effects of inclination, including Doppler boosting, gravitational focusing, and gravitational redshift, on the observed disk spectra. In the Kerr case, a simple inverse relation was found between the inferred black hole mass and the assumed inclination angle, while the inferred accretion rate (M(D/yr) remains constant. Disk spectra calculated with non-LTE stellar atmospheres instead of blackbodies do not reproduce the observations as well. Low-redshift Seyfert galaxies have relatively low accretion rates, only a few percent of their Eddington luminosities (LEdd), while the most luminous quasars are accreting nearer their Eddington limits.


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    Sun, W.-H. and Malkan, M.A., in “New Insights in Astrophysics: 8 years of UV Astronomy with IUE”, 1986, SP 263, P.641, ESA Pub., Noordwijk, The Netherlands.Google Scholar
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    Sun, W.-H. and Malkan, M.A., in “Astrophysical Jets and Their Engines”, 1987, p.125, ed. Kundt, W., Reidel.Google Scholar
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    Sun, W.-11. and Malkan, M.A., in “Supermassive Blackhole Accretion”, 1988, in press, ed. Kafatos, M., Reidel.Google Scholar

Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Wei-Hsin Sun
    • 1
  • Matthew A. Malkan
    • 2
  2. 2.UCLAUSA

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