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Properties of mid- to far-infrared dust emission in the nearby superwind galaxy M82

Published online by Cambridge University Press:  17 August 2012

Ko Arimatsu ,
Takashi Onaka ,
Itsuki Sakon ,
Fumi Egusa  and
Hidehiro Kaneda
Ko Arimatsu
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. email: arimatsu@astron.s.u-tokyo.ac.jp Institute of Space and Aeronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan email: arimatsu@ir.isas.jaxa.jp
Takashi Onaka
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. email: arimatsu@astron.s.u-tokyo.ac.jp
Itsuki Sakon
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. email: arimatsu@astron.s.u-tokyo.ac.jp
Fumi Egusa
Affiliation:
Institute of Space and Aeronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan email: arimatsu@ir.isas.jaxa.jp
Hidehiro Kaneda
Affiliation:
Graduate School of science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan.
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Abstract

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Using the reconstructed imaging data obtained with the Infrared Camera (IRC) on board AKARI, mid-infrared (MIR; 5-30 μm) emission characteristics of the superwind galaxy M82 are studied. The MIR images at four wavelengths (7, 11, 15, and 24 μm) show extended (out to distances of 4 kpc) emission mainly from polycyclic aromatic hydrocarbons (PAHs). The MIR SED of M82 halo is surprisingly constant. Using far-infrared imaging data obtained by Herschel/SPIRE, we reveal that the PAH abundance relative to the big (sub-micron sized) grains radially increases by about a factor of three. These results imply that PAHs may be formed in small and dense molecular clumps in the halo and efficiently supplied to the intergalactic space by the galactic superwind.

Keywords

infrared: galaxiesgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 210 - 212
Copyright
Copyright © International Astronomical Union 2012

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