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11.7. Signature of accretion disks in active galactic nuclei

Published online by Cambridge University Press:  25 May 2016

Anuradha Koratkar
Anuradha Koratkar*
Affiliation:
Space Telescope Science Institute 3700 San Martin Dr., Baltimore, MD 21218, USA

Extract

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One of the fundamental components of any theory of Active Galactic Nuclei (AGNs) is an accretion disk surrounding a supermassive blackhole. While most theories predict the formation of such a disk, fewer say anything about the observational consequences of the disk. Those studies which have addressed the observational signatures of accretion disks have found that the Lyman edge at 912Å is a powerful diagnostic feature for the physical characteristics of the disk. One of the important consequences of such disks is a feature at the Lyman edge (912Å). Spectroscopic investigations have found scant evidence for Lyman edge features arising in an accretion disk (Koratkar, Kinney and Bohlin 1992). Proving the existence of radiating disks in even a few AGNs would be a major step in our understanding of the phenomenon.

Type
Part III. Black Holes and Central Activity
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 469 - 470
Copyright
Copyright © Kluwer 1998 

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