Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263...43r&link_type=abstract
Astrophysical Journal, Part 1, vol. 263, Dec. 1, 1982, p. 43-53. NSF-supported research;
Astronomy and Astrophysics
Astrophysics
24
Active Galaxies, Cosmic Dust, Galactic Nuclei, Infrared Spectra, Quasars, Seyfert Galaxies, Spectral Line Width, Absorption Cross Sections, Astronomical Models, Gas Ionization, Heating, Line Spectra, Thermal Emission
Scientific paper
The present investigation is concerned with the relevant energy sources which heat (and, in many cases, destroy) the dust grains in the emission-line clouds (ELCs) that give rise to the broad-line emission seen in active extragalactic objects. The heating rates from the external radiation field, trapped line radiation, and the diffuse bound-free continua are compared. The relevant grain parameters are considered, taking into account the composition, size, and emission and absorption cross sections. Three distinct regions of an ELC are identified, including the cloud face, the extended ionized zone, and the neutral zone. The thermal emission of the dust in each of these regions is shown to be different. An upper limit to the heating is provided by an LTE model which is discussed.
Puetter Richard C.
Rudy Richard J.
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