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Title:
Effects of cold matter in active galactic nuclei - A broad hump in the X-ray spectra
Authors:
Lightman, Alan P.; White, Timothy R.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard University, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. 57-66. (ApJ Homepage)
Publication Date:
12/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACTIVE GALACTIC NUCLEI, ASTRONOMICAL SPECTROSCOPY, DARK MATTER, SPECTRAL ENERGY DISTRIBUTION, X RAY SPECTRA, BLACK HOLES (ASTRONOMY), OPTICAL THICKNESS, SPECTRUM ANALYSIS
DOI:
10.1086/166905
Bibliographic Code:
1988ApJ...335...57L

Abstract

Recent observations and interpretations of the strong UV emission from active galactic nuclei (AGNs) suggest that relatively cold, thermal matter coexists with the hot, X-ray-emitting matter near the centers of these objects. A fraction of the X-rays will be reprocessed by the cold material, and the composite X-ray spectrum should help diagnose the conditions of this material and its energy source. In a variety of situations, reprocessing of the X-rays should lead to a composite X-ray spectrum with a broad hump between about 10 keV and about 300 keV. The lower limit of this energy range is determined by atomic absorption and the upper limit by electron scattering in the cold material. Where available, observed spectra are consistent with such a broad hump; however, the predicted amplitude of the hump is about 0.1-0.5, and observations with smaller error bars are clearly needed.

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