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Using color-color diagrams to test models for the 'blue bump'Color-color diagrams are used to study the set of accretion disk plus power-law models and to determine whether they can adequately fit the optical/UV continua of a sample of 34 quasars, and the soft X-ray excesses measured for seven of the sample objects by Masnou et al. (1991). The loci of pure disk models for cos theta is greater than 0 are virtually superimposed on each other regardless of cos theta, demonstrating that a given observed spectrum cannot be described by a unique combination of S and cos theta. The distributions of model and data colors are found to overlap, showing that the disk plus power-law models do fit the distribution of data colors. For six of the seven objects, the soft X-ray excesses may be fit with an accretion disk plus power-law model without requiring the assumption of super-Eddington accretion; this shows the utility of employing Kerr disks.
Document ID
19930045830
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kuhn, O.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Mcdowell, J. C.
(NASA Marshall Space Flight Center Huntsville, AL; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States)
Elvis, M.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Wilkes, B. J.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oct. 14-16, 1991 (A93-29801 11-90)
Publisher: American Institute of Physics
Subject Category
Astrophysics
Accession Number
93A29827
Distribution Limits
Public
Copyright
Other

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