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Photometric studies of PAH emission from distant infrared galaxies

Published online by Cambridge University Press:  17 August 2012

Toshinobu Takagi ,
Hideo Matsuhara ,
Takehiko Wada  and
Youichi Ohyama
Toshinobu Takagi
Affiliation:
Institute of Space and Astronautical Science, JAXA, Sagamihara, Kanagawa 229-8510, Japan
Hideo Matsuhara
Affiliation:
Institute of Space and Astronautical Science, JAXA, Sagamihara, Kanagawa 229-8510, Japan
Takehiko Wada
Affiliation:
Institute of Space and Astronautical Science, JAXA, Sagamihara, Kanagawa 229-8510, Japan
Youichi Ohyama
Affiliation:
Academia Sinica, Institute of Astronomy and Astrophysics, Taiwan email: [email protected]
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Abstract

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Using extensive mid-IR datasets from AKARI, i.e. 9 band photometry covering the wavelength range from 2 μm to 24 μm and the unbiased spectroscopic survey for sources with Sν (9μm)>0.3 mJy, we investigated the PAHs emission features in distant starburst galaxies. PAH-selected galaxies, selected with an extremely red mid-IR colour due to PAHs, are found to have a peculiar rest-frame 11-to-8 μm flux ratio, which is systematically smaller than nearby starburst/AGN spectral templates. This may indicate a systematic difference in the physical condition of the ISM between nearby and distant starburst galaxies.

Keywords

infrared: galaxiesgalaxies: starburstISM: evolutiondust
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 456 - 459
Copyright
Copyright © International Astronomical Union 2012

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