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http://dx.doi.org/10.5303/PKAS.2017.32.1.077

PROCESSING OF INTERSTELLAR MEDIUM AS DIVULGED BY AKARI  

Onaka, Takashi (Department of Astronomy, Graduate School of Science, The University of Tokyo)
Mori, Tamami I. (Department of Astronomy, Graduate School of Science, The University of Tokyo)
Ohsawa, Ryou (Department of Astronomy, Graduate School of Science, The University of Tokyo)
Sakon, Itsuki (Department of Astronomy, Graduate School of Science, The University of Tokyo)
Bell, Aaron C. (Department of Astronomy, Graduate School of Science, The University of Tokyo)
Hammonds, Mark (Department of Astronomy, Graduate School of Science, The University of Tokyo)
Shimonishi, Takashi (Department of Earth and Planetary Sciences, Graduate School of Science, Kobe University)
Ishihara, Daisuke (Graduate School of Science, Nagoya University)
Kaneda, Hidehiro (Graduate School of Science, Nagoya University)
Okada, Yoko (I. Physikalisches Institut, Universitat zu Koln)
Tanaka, Masahiro (Center for Computational Sciences, University of Tsukuba)
Publication Information
Publications of The Korean Astronomical Society / v.32, no.1, 2017 , pp. 77-81 More about this Journal
Abstract
A wide spectral coverage from near-infrared (NIR) to far-infrared (FIR) of AKARI both for imaging and spectroscopy enables us to efficiently study the emission from gas and dust in the interstellar medium (ISM). In particular, the Infrared Camera (IRC) onboard AKARI offers a unique opportunity to carry out sensitive spectroscopy in the NIR ($2-5{\mu}m$) for the first time from a spaceborn telescope. This spectral range contains a number of important dust bands and gas lines, such as the aromatic and aliphatic emission bands at 3.3 and $3.4-3.5{\mu}m$, $H_2O$ and $CO_2$ ices at 3.0 and $4.3{\mu}m$, CO, $H_2$, and H I gas emission lines. In this paper we concentrate on the aromatic and aliphatic emission and ice absorption features. The balance between dust supply and destruction suggests significant dust processing taking place as well as dust formation in the ISM. Detailed analysis of the aromatic and aliphatic bands of AKARI observations for a number of H ii regions and H ii region-like objects suggests processing of carbonaceous dust in the ISM. The ice formation process can also be studied with IRC NIR spectroscopy efficiently. In this review, dust processing in the ISM divulged by recent analysis of AKARI data is discussed.
Keywords
infrared: ISM; ISM: general; ISM: dust;
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