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Detection of the unidentified infrared bands in a filament of the dwarf galaxy NGC1569

Published online by Cambridge University Press:  01 February 2008

H. Matsumoto ,
T. Onaka ,
I. Sakon  and
H. Kaneda
H. Matsumoto
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
T. Onaka
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
I. Sakon
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
H. Kaneda
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 229-8510, Japan
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Abstract

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We made near- to mid-infrared imaging and spectroscopic observations of the dwarf galaxy NGC 1569 with the Infrared Camera (IRC) on board AKARI. The unidentified infrared (UIR) band features at 6.2, 7.7, and 11.2 μm, which are generally attributed to polycyclic aromatic hydrocarbons (PAHs), are clearly detected in a structure associated with an Hα filament. The filament is filled with X-ray emission and is thought to be formed by outflow from the galaxy. Since PAHs are destroyed rapidly in hot plasma, it is most likely that PAHs in the filament are produced from fragmentation of large carbonaceous grains in the shock. We also detect excess emission in 2–5 μm in the filament, which may come from very small grains.

Keywords

Infrared: galaxiesdustextinctiongalaxies: individual (NGC1569)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 249 - 250
Copyright
Copyright © International Astronomical Union 2008

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