Abstract
The electromagnetic spectrum of quasars and Seyfert 1 galaxies shows an excess of energy at λ > 4000 Å over the extrapolation of the infrared/optical spectrum: This ”blue bump” is generally interpreted as thermal radiation by gas at T > 3.104 °K. But is it an accretion disk which emits this thermal radiation? To answer this question geometrical and kinematical information on the dense gas in the vicinity of the black hole is needed. We examine the most important observations in favor or against the presence of an accretion disk: the photoelectric X-ray absorption, the energy budget in the broad line region, and the profiles of the Balmer lines. The optical polarization and the occurrence of Lyman edge absorptions are also reviewed.
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Ulrich, MH. (1989). Observational Evidence for Accretion Disks in Galactic Nuclei. In: Meyer, F., Duschl, W.J., Frank, J., Meyer-Hofmeister, E. (eds) Theory of Accretion Disks. NATO ASI Series, vol 290. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1037-9_2
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DOI: https://doi.org/10.1007/978-94-009-1037-9_2
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