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PAH evolution in the harsh environment of the ISM

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens ,
H. Kaneda ,
T. Onaka ,
I. Sakon ,
D. Ishihara ,
A. Mouri ,
M. Yamagishi  and
A. Yasuda
H. Kaneda
Affiliation:
G. School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
T. Onaka
Affiliation:
Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
I. Sakon
Affiliation:
Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
D. Ishihara
Affiliation:
G. School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
A. Mouri
Affiliation:
G. School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
M. Yamagishi
Affiliation:
G. School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
A. Yasuda
Affiliation:
G. School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan

Abstract

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We review observational results of PAH emission in harsh interstellar environments, which are mostly based on recent works by Spitzer and AKARI. The harsh environments include shock regions in our Galaxy, the ionized superwinds and haloes of external galaxies, and the hot plasmas of elliptical galaxies. Owing to the unprecedented high sensitivity for PAH emission with Spitzer and AKARI, it is found that an appreciable amount of PAHs are present in some cases with such hostile conditions. Some of them exhibit unusual PAH interband strength ratios, reflecting either evolution of PAHs or physical conditions of the ISM. The distribution of the PAH emission, as compared to that of dust emission, is shown to discuss their ways of evolution and survival.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 46: PAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis , 2011 , pp. 157 - 168
Copyright
© EAS, EDP Sciences 2011

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