Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711406k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #114.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a model using the evolution of the stellar population in a starburst galaxy to predict the crystallinity of the silicates in the interstellar medium of this galaxy. We take into account dust production in stellar ejecta, and amorphization and destruction in the interstellar medium and find that a detectable amount of crystalline silicates may be formed using relatively extreme input parameters. We discuss the effect of dust destruction and amorphisation of supernovae, and the relatively low dust-production efficiency of supernovae, and find that when taking this into account, crystallinity in the interstellar medium becomes hard to detect. Levels of 6.5-13% crystallinity in the interstellar medium of Ultraluminous Infrared Galaxies have been observed (Spoon et al. 2006, ApJ 638, 759). We conclude that not all these crystalline silicates can be of stellar (e.g. starburst related) origin, and additional crystallisation must be asociated with AGN activity.
Kemper Francisca
Markwick Andrew J.
Woods Paul M.
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