Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..804..197d&link_type=abstract
PLANETARY NEBULAE AS ASTRONOMICAL TOOLS: International Conference on Planetary Nebulae as Astronomical Tools. AIP Conference Pr
Astronomy and Astrophysics
Astronomy
3
Interstellar Matter, Cosmic Dust, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus
Scientific paper
Interstellar dust particles undergo a complex series of processes starting with their formation in quiescent or explosive sources, followed by their injection into the interstellar medium, their processing by thermal sputtering and evaporative grain-grain collisions behind interstellar shock waves, and their growth by accretion and coagulation in molecular clouds. These evolutionary processes can be quantitatively described in the framework of a chemical evolution model which follows the fraction of a given element present in the gas or solid phase of the interstellar medium. Such models must be subject to strict cosmic abundances constraints. We describe here the general outline for constructing such models. In particular, such models predict the delayed injection of carbon dust that formed in AGB winds into the interstellar medium, an effect manifested in Spitzer IRAC and MIPS observations of PAH emission from galaxies of different metallicities.
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