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Properties of mid- to far-infrared dust emission in the nearby superwind galaxy M82
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Properties of mid- to far-infrared dust emission in the nearby superwind galaxy M82
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Properties of mid- to far-infrared dust emission in the nearby superwind galaxy M82
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Journal Article
Properties of mid- to far-infrared dust emission in the nearby superwind galaxy M82
2011
Overview
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.
Publisher
Cambridge University Press,Cambridge University Press (CUP)
