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Properties of polycyclic aromatic hydrocarbons in the star forming environment in nearby galaxies

Published online by Cambridge University Press:  01 February 2008

Itsuki Sakon ,
Takashi Onaka ,
Daisuke Kato ,
Hidehiro Kaneda ,
Hirokazu Kataza ,
Yoko Okada ,
Akiko Kawamura ,
Toshikazu Onishi  and
Yasuo Fukui
Itsuki Sakon
Affiliation:
Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: isakon@astron.s.u-tokyo.ac.jp
Takashi Onaka
Affiliation:
Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: isakon@astron.s.u-tokyo.ac.jp
Daisuke Kato
Affiliation:
Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: isakon@astron.s.u-tokyo.ac.jp
Hidehiro Kaneda
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
Hirokazu Kataza
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
Yoko Okada
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
Akiko Kawamura
Affiliation:
Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Toshikazu Onishi
Affiliation:
Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Yasuo Fukui
Affiliation:
Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
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Abstract

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We have carried out the mid-infrared slit spectroscopic observations of sources in the LMC and in NGC 6946 with AKARI/IRC. We investigate the properties of the UIR bands in terms of the star forming activities. We find systematically larger ratios of UIR bands in 6–9 μm to 11.2 μm band in active star forming regions than in the quiet regions. This behavior is consistent with the photo-ionization model of PAHs. Our results suggest that the ratios of UIR bands in 6–9 μm to 11.2 μm band can be used as more efficient and vigorous tools to measure the extent of on-going star formation in remote galaxies rather than just the presence or absence of the features themselves.

Keywords

DustextinctionISM: lines and bandsgalaxies: ISMinfrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 241 - 246
Copyright
Copyright © International Astronomical Union 2008

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