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Variable soft X-ray excesses in active galactic nuclei from nonthermal electron-positron pair cascadesIn the present study of the formation of steep soft X-ray excesses that are superposed on flatter, hard X-ray power-law spectra in nonthermal electron-positron pair cascade sources, the soft excess in pair-cascade AGN models appears as a steep power law superposed on the tail of the UV bump and the flat nonthermal (hard X-ray) power law. The model-parameter space in which an excess in soft X-rays is visible is ascertained, and the time-variability of soft excesses in pair cascade models is examined. It is established that the parameter space in which soft excesses appear encompasses the range of preferred input parameters for a recently development Compton reflection model of UV and X-ray emission from the central engine of an AGN.
Document ID
19910062386
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Zdziarski, Andrzej A.
(Polish Academy of Sciences, Astronomical Center Warsaw, Poland)
Coppi, Paolo S.
(Chicago, University IL, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 376
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A47009
Funding Number(s)
CONTRACT_GRANT: NSF AST-89-15326
CONTRACT_GRANT: NAGW-1301
CONTRACT_GRANT: NAGW-830
CONTRACT_GRANT: NAGW-1636
CONTRACT_GRANT: NSF AST-8615325
Distribution Limits
Public
Copyright
Other

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