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Title:
Spectroscopic constraints on the properties of dust in active galactic nuclei
Authors:
Laor, Ari; Draine, Bruce T.
Affiliation:
AA(Inst. for Advanced Study, Princeton, NJ), AB(Princeton Univ. Observatory, NJ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 441-468. (ApJ Homepage)
Publication Date:
01/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ACTIVE GALACTIC NUCLEI, ASTRONOMICAL MODELS, ASTRONOMICAL SPECTROSCOPY, COMPUTATIONAL ASTROPHYSICS, COSMIC DUST, EMISSION SPECTRA, GRAIN SIZE, GRAPHITE, INTERSTELLAR EXTINCTION, OPTICAL PROPERTIES, OPTICAL THICKNESS, SILICON CARBIDES
DOI:
10.1086/172149
Bibliographic Code:
1993ApJ...402..441L

Abstract

The optical properties of graphite, silicate, and SiC grains over the wavelength range 1000 microns - 1 A are calculated for grains in the 0.005-10-micron size range. Both graphite + silicate (MRN) and graphite + SiC grain mixtures are considered, with various grain size distributions. A detailed radiative transfer calculation is performed to obtain constraints on the emission properties of dust in AGN in either 'optically thin' or optically thick configurations. Warm graphite + silicate or graphite + SiC dust (T is greater than 200 K) with the MRN size distribution and a column density less than about 10 exp 23/sq cm produces a strong silicate or SiC emission feature. Such dust cannot be responsible for the observed IR emission from AGN. MRN dust with a high optical depth at 10 microns produces an emission feature with an amplitude of about 57 percent, in excess of the typical observational limit for most objects. Reddening of the broad emission lines and continuum is unlikely to be common.

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