AKARI Observations of the ISM in Nearby Galaxies

Details AKARI Observations of the ISM in Nearby Galaxies AKARI Observations of the ISM in Nearby Galaxies

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..32k&link_type=abstract

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

Mathematics

Logic

Galaxies: Ism, Infrared: Galaxies, Infrared: Ism, Ism: Dust, Extinction, Ism: Structure

Scientific paper

With AKARI, we have observed about 80 nearby galaxies that include various morphological types and thus extensive ranges in ISM environments and star formation history. Among them, we report on some of our recent results for 20 nearby elliptical galaxies, which are combined with those with Spitzer. We have detected PAHs and extended dust emissions from many of our sample galaxies. Most of those galaxies have a peculiar PAH emission spectrum with unusually strong 11.3 μm and 17 μm features relative to the 7.7 μm feature. Some of the elliptical galaxies so far observed with AKARI also exhibit the presence of the PAH 3.3 μm emission feature (i.e. very small PAHs). On the basis of these results, we conclude that the unusual PAH emission features are attributed mostly to a large fraction of neutral to ionized PAHs in the interstellar space of the elliptical galaxies.

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