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Dust and PAHs in X-ray plasma of elliptical galaxies

Published online by Cambridge University Press:  17 August 2012

Hidehiro Kaneda ,
Takashi Onaka ,
Toyoaki Suzuki ,
Tatsuya Mori ,
Mitsuyoshi Yamagishi ,
Toru Kondo  and
Akiko Yasuda
Hidehiro Kaneda
Affiliation:
Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
Takashi Onaka
Affiliation:
Department of Astronomy, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0003, Japan
Toyoaki Suzuki
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 252-5210, Japan email: [email protected]
Tatsuya Mori
Affiliation:
Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
Mitsuyoshi Yamagishi
Affiliation:
Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
Toru Kondo
Affiliation:
Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
Akiko Yasuda
Affiliation:
Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
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Abstract

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Many elliptical galaxies possess an appreciable amount of X-ray-emitting hot plasma, providing a harsh interstellar environment for the survival of dust grains and polycyclic aromatic hydrocarbons (PAHs). Despite such a hostile environment, it has been found that a significant fraction of X-ray elliptical galaxies contain a considerable amount of dust, which cannot be explained solely from replenishment by old stars. Some of them even show the presence of PAHs. We present the results of AKARI and Spitzer observations of dust and PAHs in X-ray elliptical galaxies. We investigate their possible origins and discuss the implications of their presence for the evolution of elliptical galaxies.

Keywords

ISM: dustextinction - infrared: galaxies - galaxies: elliptical and lenticularcD - galaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 254 - 258
Copyright
Copyright © International Astronomical Union 2012

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