The Evolution of PAHs and SN-Condensed Dust in Galaxies

Details The Evolution of PAHs and SN-Condensed Dust in Galaxies The Evolution of PAHs and SN-Condensed Dust in Galaxies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe...5d&link_type=abstract

"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere

Physics

Ism: Dust, Infrared: Galaxies, Galaxies: Starburst, Galaxies: Evolution, Stars: Post-Agb, Supernovae Remnants

Scientific paper

Spectral and photometric observations of nearby galaxies show a correlation between the strength of their mid-IR aromatic features, attributed to PAH molecules, and their metal abundance, leading to a deficiency of these features in low-metallicity galaxies. We suggest that the observed correlation represents a trend of PAH abundance with galactic age, reflecting the delayed injection of carbon dust into the ISM by AGB stars in the final post-AGB phase of their evolution. We also show that larger dust particles giving rise to the far-IR emission follow a distinct evolutionary trend closely related to the prompt injection of dust by massive stars into the ISM.

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