Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..122v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 122-140.
Astronomy and Astrophysics
Astrophysics
61
Active Galaxies, Cosmic Dust, Evaporation, Interstellar Matter, Quasars, Seyfert Galaxies, X Ray Irradiation, Infrared Spectra, Ionization Cross Sections, Numerical Integration, Optical Thickness, Photoionization, X Ray Spectra
Scientific paper
A fundamental physical study of grains heated transiently by X-rays is presented. The X-ray photoionization cross sections used to determine the rate of energy deposition into the grains are given. A grain model is constructed and the radiative and evaporative responses of grains into X-ray absorption are described. The basic theory of stochastic grain heating is outlined, and analytical expressions for the temperature distributions of flickering grains are provided. The resulting IR spectra due to X-ray illumination are given, and the relevance of the present work to the IR continua of active galaxies is discussed. The present model provides two observational predictions: the infrared spectra of grains, even if they are superheated, should show a cutoff between 1 and 3 microns; and X-ray-illuminated environments should exhibit no PAH emissions.
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